April 10 in History

The Year of the Six Emperors was the year 238 CE, during which at least six different men made claims to be emperors of Rome. The events of the year were characteristic of the period dubbed the Crisis of the Third Century (235–285 CE) by later historians. The year began with Maximinus Thrax as ruler of the Roman Empire. A tax revolt in the province of Africa briefly saw Gordian I and his son Gordian II proclaimed co-emperors and recognized as such by the Senate in Rome. The African revolt was swiftly crushed, and the Senate, fearing reprisal from Maximinus for supporting the now-dead Gordians, proclaimed Pupienus and Balbinus as new emperors and charged them with defending the capital. Bowing to popular pressure, the Senate also elevated the 13-year-old Gordian III, grandson of Gordian I. During the subsequent siege of Aquileia, Maximinus was assassinated by his own troops. Pupienus and Balbinus were later murdered by the Praetorian Guard, leaving Gordian III the sole nominal ruler of the empire. Although most often referred to as the Year of Six Emperors, there were actually seven different individuals who claimed imperial title over the course of the year. As such, it is referred to as the Year of the Seven Emperors in some literature on the subject. The discrepancy lies in whether to count Gaius Julius Verus Maximus, the son of Maximinus Thrax, who bore the title caesar but was never proclaimed full augustus. Edward Gibbon, in his History of the Decline and Fall of the Roman Empire, includes Maximus when he notes how "in the space of a few months, six princes had been cut off by the sword", before Gordian III became sole emperor.

Nestorius of Constantinople (; Ancient Greek: Νεστόριος; Syriac: ܡܪܝ ܢܣܛܘܪܝܣ, Mār Nesṭōrīs; c. 386 – c. 451) was an early Christian prelate who served as Archbishop of Constantinople from 10 April 428 to 11 July 431. He was a Christian theologian from the Catechetical School of Antioch, and several of his teachings in the fields of Christology and Mariology were seen as controversial and heretical, causing major disputes. In 431, he was condemned and deposed from his see by the Council of Ephesus, presided over by his archrival Cyril of Alexandria, but the counter-council led by John I of Antioch vindicated him and deposed Cyril in return. Nestorius refrained from attending both of these councils and instead sought retirement from the Byzantine Emperor. Nestorius himself used the title Theotokos and did not advocate for its ban. His teachings included cautious usage of Theotokos ("God-Bearer"), used for Mary, mother of Jesus, in order that Christ's human and divine natures not be confused, as he believed Christ was born according to his humanity and not his divinity, which indicated his preference for the concept of the prosopic union of two natures (divine and human) of Christ, over the later concept of a hypostatic union. He proposed instead the title of Christotokos ("Christ-bearer"). This brought him into conflict with Cyril of Alexandria and other prominent miaphysite churchmen of the time, who accused him of heresy. If the babe and the Lord of the babe are one and the same person, the suspected phrase "inhabitant of the babe" must be simply intended as a safeguard against identification of the Word with the flesh. So Mary is Theotokos – because the Word was united to the temple ... which is in nature consubstantial with the holy Virgin ... It is in virtue of this union that the holy Virgin is called Theotokos Nestorius sought to defend himself at the Council of Ephesus in 431, but instead found himself formally condemned for heresy by a majority of the bishops and was subsequently removed from his see. On his own request, he retired to his former monastery, in or near Antioch. In 435, Theodosius II sent him into exile in Upper Egypt, where he lived on until about 451, strenuously defending his views. His last major defender within the Roman Empire, Theodoret of Cyrrhus, finally agreed to anathematize him in 451 during the Council of Chalcedon. From then on, he had no defenders within the empire, but the Church of the East in the Persian Empire never accepted his condemnation. That led later Western Christians to give the name Nestorian Church to the Church of the East where his teachings were deemed orthodox and in line with its own teachings. Nestorius is revered as among three "Greek Teachers" (in addition to Diodorus of Tarsus and Theodore of Mopsuestia) of the Church of the East. The East Syriac Eucharistic Service, which is known to be among the oldest in the world, incorporates prayers attributed to Nestorius himself. The discovery, translation and publication of his Bazaar of Heracleides at the beginning of the 20th century have led to a reassessment of his theology in Western scholarship. It is now argued by some scholars and clergy that his ideas are compatible with later Chalcedonian theology and/or his condemnation at Ephesus was misplaced, but the orthodoxy of his formulation of the doctrine of Christ is still controversial.

Halley's Comet is the only known short-period comet that is consistently visible to the naked eye from Earth, appearing roughly every 74–79 years. It last appeared in the inner parts of the Solar System in 1986 and will next appear in mid-2061. Officially designated 1P/Halley, it is also commonly called Comet Halley, or sometimes simply Halley.

Pope Leo IV (died 17 July 855) was the bishop of Rome and leader of the Papal States from 10 April 847 to his death in 855. He is remembered for repairing Roman churches that had been damaged during the Arab raid against Rome, and for building the Leonine Wall around Vatican Hill to protect the city. Pope Leo organized a league of Italian cities who fought and won the sea Battle of Ostia against the Saracens.

The 5th Karmapa, Deshin Shekpa (1384–1415),, was the 5th Gyalwa Karmapa, head of the Karma Kagyu, a subschool of the Kagyu School of Tibetan Buddhism. Deshin Shekpa was born in Nyang Dam in the south of Tibet. According to the lineage, he said after being born: "I am the Karmapa. Om mani padme hum shri." Deshin Shekpa was then taken to Tsawa Phu who recognized him as the reincarnation of the 4th Karmapa.

Ludovico Maria Sforza, also known as Ludovico il Moro, and called the "arbiter of Italy" by historian Francesco Guicciardini, was an Italian nobleman who ruled as the Duke of Milan from 1494 to 1499.

Potosí, known as Villa Imperial de Potosí in the colonial period, is the capital city and a municipality of the Department of Potosí in Bolivia. It is one of the highest cities in the world at a nominal 4,067 m (13,343 ft). Diego Huallpa, an indigenous prospector, is traditionally credited with the discovery of the Cerro Rico in 1545, which led to the founding and rapid growth of Potosí due to its extraordinary silver wealth. For centuries, it was the location of the Spanish colonial silver mint. A considerable amount of the city's colonial architecture has been preserved in the historic center of the city, which—along with the globally important Cerro Rico de Potosí—are part of a designated UNESCO World Heritage Site. Potosí lies at the foot of the Cerro de Potosí—sometimes referred to as the Cerro Rico ("rich mountain")—a mountain popularly conceived of as being "made of" silver ore that dominates the city. The Cerro Rico is the reason for Potosí's historical importance since it was the major supply of silver for the Spanish Empire until Guanajuato in Mexico surpassed it in the 18th century. At the turn of the 16th/17th centuries, it was the second largest city in the world, after London. The silver was taken by llama and mule train to the Pacific coast, shipped north to Panama City, and carried by mule train across the isthmus of Panama to Nombre de Dios or Portobelo, whence it was taken to Spain on the Spanish treasure fleets. Some of the silver also made its way east to Buenos Aires, via the Rio de la Plata, or to Acapulco, Mexico, where it was sent via the Manila Galleons to buy Asian products. Cerro de Potosí's peak is 4,824 m (15,827 ft) above sea level. Today, Potosí continues to be an important mining center, and is the largest urban center in the Department of Potosí. A growing city, Potosí is now famous for its well-preserved colonial architecture, and unusual geographic setting as one of the highest cities in the world. It features a rare cold highland climate, and is marked by its long dry period, and short but strong wet season. While famous for its dominance as a mining center in early Spanish colonial history, Potosí still sits at one of the largest silver deposit systems in the world.

The Virginia Company of London (sometimes called "London Company") was a division of the Virginia Company with responsibility for colonizing the east coast of North America between latitudes 34° and 41° N.

The Statute of Anne, also known as the Copyright Act 1709 or the Copyright Act 1710 (cited either as 8 Ann. c. 21 or as 8 Ann. c. 19), was an act of the Parliament of Great Britain passed in 1710, which was the first statute to provide for copyright regulated by the government and courts, rather than by private parties. Prior to the statute's enactment in 1710, copying restrictions were authorised by the Licensing of the Press Act 1662 (14 Cha. 2. c. 33). These restrictions were enforced by the Stationers' Company, a guild of printers given the exclusive power to print—and the responsibility to censor—literary works. The censorship administered under the 1662 act led to public protest; as the act had to be renewed at two-year intervals, authors and others sought to prevent its reauthorisation. Following the expiry of the 1662 act in 1694, Parliament refused to renew the act, ending the Stationers' monopoly and press restrictions. Over the next 10 years the Stationers repeatedly advocated bills to re-authorise the old licensing system, but Parliament declined to enact them. Faced with this failure, the Stationers decided to emphasise the benefits of licensing to authors rather than publishers, and the Stationers succeeded in getting Parliament to consider a new bill. On 12 December 1709, the Stationers submitted yet another petition asking for legislation on the issue, and the House of Commons gave three MPs – Spencer Compton, Craven Peyton and Edward Wortley – permission to form a drafting committee. On 11 January 1710, Wortley introduced this bill, titling it A Bill for the Encouragement of Learning and for Securing the Property of Copies of Books to the rightful Owners thereof. This bill, which after substantial amendments was granted royal assent on 5 April 1710, became known as the Statute of Anne owing to its passage during the reign of Queen Anne. The new law prescribed a copyright term of 14 years, with a provision for renewal for a similar term, during which only the author and the printers to whom they chose to license their works could publish the author's creations. Following this, the work's copyright would expire, with the material falling into the public domain. Despite a period of instability known as the Battle of the Booksellers when the initial copyright terms under the statute began to expire, the statute remained in force until the Copyright Act 1842 (5 & 6 Vict. c. 45) replaced it. The statute is considered a "watershed event in Anglo-American copyright history ... transforming what had been the publishers' private law copyright into a public law grant". Under the statute, copyright was for the first time vested in authors rather than publishers; it also included provisions for the public interest, such as a legal deposit scheme. The statute was an influence on copyright law in several other nations, including the United States, and even in the 21st century is "frequently invoked by modern judges and academics as embodying the utilitarian underpinnings of copyright law".

Robert Walpole, 1st Earl of Orford (; 26 August 1676 – 18 March 1745), known between 1725 and 1742 as Sir Robert Walpole, was a British Whig statesman who is generally regarded as the de facto first Prime Minister of Great Britain, serving from 1721 to 1742. His formal titles included First Lord of the Treasury, Chancellor of the Exchequer, and Leader of the House of Commons. He is the longest serving prime minister in UK history, with a tenure of over 20 years. Although the exact dates of Walpole's dominance, dubbed the "Robinocracy", are a matter of scholarly debate, the period 1721–1742 is often used. He dominated the Walpole–Townshend ministry, as well as the subsequent Walpole ministry, and holds the record as the longest-serving British prime minister. W. A. Speck wrote that Walpole's uninterrupted run of 20 years as prime minister "is rightly regarded as one of the major feats of British political history. Explanations are usually offered in terms of his expert handling of the political system after 1720, [and] his unique blending of the surviving powers of the crown with the increasing influence of the Commons". Walpole was a Whig from the gentry class who was first elected to Parliament in 1701 and held many senior positions. He was a country squire and looked to country gentlemen for his political base. Historian F. O'Gorman says his leadership in Parliament reflected his "reasonable and persuasive oratory, his ability to move both the emotions as well as the minds of men, and, above all, his extraordinary self-confidence". Julian Hoppit says Walpole's policies sought moderation, he worked for peace, lower taxes and growing exports, and allowed a little more tolerance for Protestant Dissenters. He mostly avoided controversy and high-intensity disputes as his middle way attracted moderates from both the Whig and Tory camps; his appointment to Chancellor of the Exchequer after the South Sea Bubble stock-market crisis drew attention to perceived protection of political allies by Walpole. Historian H. T. Dickinson sums up his historical role by saying that "Walpole was one of the greatest politicians in British history. He played a significant role in sustaining the Whig party, safeguarding the Hanoverian succession, and defending the principles of the Glorious Revolution (1688). He established stable political supremacy for the Whig party and taught succeeding ministers how best to establish an effective working relationship between Crown and Parliament." Some scholars rank him highly among British prime ministers.

Johann Sebastian Bach was a German composer and musician of the late Baroque period. He is known for his prolific output across a variety of instruments and forms, including the orchestral Brandenburg Concertos; solo instrumental works such as the Cello Suites and Sonatas and Partitas for Solo Violin; keyboard works such as the Goldberg Variations and The Well-Tempered Clavier; organ works such as the Schübler Chorales and the Toccata and Fugue in D minor; and choral works such as the St. Matthew Passion and the Mass in B minor. He is known for his mastery of counterpoint, as heard in The Musical Offering and The Art of Fugue. Felix Mendelssohn precipitated the Bach Revival with a performance of the St. Matthew Passion in 1829. Ever since, Bach has been acclaimed as one of the greatest composers in the history of Western music.

The War of the Austrian Succession, 1740 to 1748, was a conflict between the European great powers, fought primarily in Europe, the Atlantic Ocean and Mediterranean Sea. Related conflicts include King George's War, the War of Jenkins' Ear, the First Carnatic War, and the First and Second Silesian Wars.

The War of the First Coalition was a set of wars between a coalition of several European powers and France fought from 1792 to 1797. The coalition was only loosely allied and fought without much coordination; each power wanted to annex a different part of France should they defeat the French, something that never occurred.

The Napoleonic Wars (1803–1815) were a global series of conflicts fought by a fluctuating array of European coalitions against the French First Republic (1803–1804) under the First Consul followed by the First French Empire (1804–1815) under the Emperor of the French, Napoleon. The wars originated in political forces arising from the French Revolution (1789–1799) and French Revolutionary Wars (1792–1802) and produced a period of French domination over continental Europe. The wars are categorised as seven conflicts, five named after the coalitions that fought Napoleon, plus two named for their respective theatres: the War of the Third Coalition, War of the Fourth Coalition, War of the Fifth Coalition, War of the Sixth Coalition, War of the Seventh Coalition, the Peninsular War, and the French invasion of Russia. The first stage of the wars broke out when Britain declared war on France on 18 May 1803. After minor campaigns, Britain allied with Austria, Russia, and minor powers, to form the Third Coalition in April 1805. Napoleon defeated the allied Russo-Austrian armies in the subsequent war which climaxed in French victories at Ulm and at Austerlitz, leading to the dissolution of the Holy Roman Empire and Austria being forced to make peace. Britain and Russia remained at war with France. Concerned about increasing French power, Prussia joined Britain and Russia in the Fourth Coalition, which resumed war in October 1806. Napoleon defeated the Prussians at Jena-Auerstedt and the Russians at Friedland, bringing an uneasy peace to the continent by July 1807, and again leaving Britain as France's sole major enemy. Britain was unable to dispute French dominance on the continent but obtained hegemony over the seas after victories including Trafalgar. Russia used the interim peace to resolve wars with the Ottomans, Swedes, and Iranians. Hoping to isolate and weaken Britain economically through his Continental System, Napoleon launched an invasion of Portugal, the only remaining British ally in continental Europe. After occupying Lisbon in November 1807, and with the bulk of French troops present in Spain, Napoleon seized the opportunity to turn against his former ally, depose the reigning Spanish royal family, and declare his brother as Joseph I the King of Spain in 1808, to the disapproval of the Spanish populace. Spain joined Britain and Portugal, with the three powers engaging France in the Peninsular War. The diversion of French armies to the large new Anglo-Spanish front led to Austria reentering the conflict and forming the Fifth Coalition in April 1809, composed of Austria, Spain, and Britain. Austria won the Battle of Aspern-Essling but was defeated at Wagram, forcing the imposition of a harsh peace in October 1809. Britain, Spain, and Portugal remained at war with France. Concurrently Russia, unwilling to bear the economic consequences of reduced trade, violated the Continental System, prompting Napoleon to launch an invasion in June 1812. The resulting campaign was costly for both sides, but ultimately ended in disaster for France and the near-destruction of Napoleon's Grande Armée. French forces retreated from Russia by December 1812 and began reconstituting their lost strength. Encouraged by the defeat, Austria, Prussia, and several minor powers joined Russia, Britain, and Spain in a Sixth Coalition and began a campaign against France. The Sixth Coalition defeated Napoleon at Leipzig in October 1813. The allies then invaded France on two fronts: the Russians, Austrians, and Prussians invaded France from the east, while the British, Spanish, and Portuguese invaded France from the west. Coalition troops captured Paris in March 1814, forced Napoleon to abdicate in April, exiled him to the island of Elba, and restored power to the Bourbons. Napoleon escaped exile in February 1815 and reassumed control of France for around one hundred days, igniting the eponymous conflict. The allies formed the Seventh Coalition, which defeated him at Waterloo in June 1815 and exiled him to Saint Helena, where he died in 1821. The wars had profound consequences on history. New methods of warfare were introduced, including mass conscription and guerrilla warfare. Politically, the wars greatly influenced Europe through the advancements in civil law brought about by the Napoleonic Code, which was largely retained where it was adopted, and the spread of nationalism and liberalism. Independence movements emerged in Spanish America as a direct consequence of the wars, leading to the decline of the Spanish and Portuguese Empires. France's defeat led to the rise of Britain as the world's foremost naval and economic power, a status it would hold for the remainder of the century. After the end of the Napoleonic Wars, the Congress of Vienna redrew Europe's borders and brought a relative peace to the continent, with no major great power conflicts until the Crimean War in 1853.

Field Marshal Arthur Wellesley, 1st Duke of Wellington (né Wesley; 1 May 1769 – 14 September 1852), was a British Army officer and statesman. A leading figure in early-19th-century British politics, Wellesley served as Prime Minister of the United Kingdom and as Commander-in-Chief of the Forces. Wellesley was born into the Wellesley family in Dublin, in the Kingdom of Ireland. He was commissioned as an ensign in the British Army in 1787, serving in Ireland as aide-de-camp to two successive lords lieutenant of Ireland. He was also elected as a member of Parliament in the Irish House of Commons. Rising to the rank of colonel by 1796, Wellesley served in the Flanders campaign before being sent to India, where he fought in the Fourth Anglo-Mysore War, ending the conflict with a victory at Seringapatam in 1799. He was appointed governor of Seringapatam and Mysore and, as a newly appointed major general, won a decisive victory over the Maratha Confederacy at the Battle of Assaye in 1803. Rising to prominence as a general officer during the Peninsular War, Wellesley was promoted to field marshal after leading British-led forces to victory against a French army at the Battle of Vitoria in 1813. Following Napoleon's first exile in 1814, he served as the British ambassador to France and was made Duke of Wellington. During the Hundred Days campaign in 1815, Wellington commanded another British-led army which, together with a Prussian army under Field Marshal Gebhard von Blücher, defeated Napoleon at Waterloo. After the end of his active military career, Wellington returned to politics, becoming a prominent member of the British Tory party. He served as prime minister from 1828 to 1830, as well as on an interim basis for a little less than a month in 1834. Wellington oversaw the passage of the Roman Catholic Relief Act 1829 and opposed the Reform Act 1832. He continued to be one of the leading figures in the House of Lords until his retirement in 1846 and remained Commander-in-Chief of the Forces until his death in 1852.

Mount Tambora, or Tomboro, is an active stratovolcano in West Nusa Tenggara, Indonesia. Located on Sumbawa in the Lesser Sunda Islands, volcanism is the result of subduction zones. The 1815 eruption was the largest in recorded history, erupting up to 150 cubic kilometers of volcanic material, making it a VEI-7 on the Volcanic Explosivity Index. This caused the summer of 1816 to become known as the "Year Without a Summer" due to global cooling from the eruption.

The federal government of the United States is the national government of the United States.

Gregory V of Constantinople (Greek: Γρηγόριος; 1746 – 10 April 1821), born Georgios Angelopoulos (Γεώργιος Αγγελόπουλος), was Ecumenical Patriarch of Constantinople from 1797 to 1798, from 1806 to 1808, and from 1818 to 1821. He was responsible for much restoration work to the Patriarchal Cathedral of St George, which had been badly damaged by fire in 1738.

The Greek War of Independence, also known as the Greek Revolution or the Greek Revolution of 1821, was a successful war of independence fought by Greek revolutionaries against the Ottoman Empire from 1821 to 1829. In 1826, the Greeks were assisted by the British Empire, the Kingdom of France, and the Russian Empire, while the Ottomans were aided by their vassals, especially by the Eyalet of Egypt. The war led to the formation of modern Greece, which in subsequent years would be expanded to its current size. The revolution is commemorated by Greeks in Greece and the Greek diaspora on 25 March, as Independence Day. All Greek territory, except the Ionian Islands, came under Ottoman rule in the 15th century, in the decades surrounding the Fall of Constantinople. During the following centuries, there were sporadic but unsuccessful Greek uprisings against Ottoman rule. In 1814, a secret organization called the Filiki Eteria (Society of Friends) was founded by Nikolaos Skoufas, Emmanuil Xanthos, and Athanasios Tsakalov with the aim of liberating Greece. It planned to launch revolts in the Peloponnese, the Danubian Principalities, and Constantinople. The insurrection was planned for 25 March 1821, the Orthodox Christian Feast of the Annunciation. However, the plans were discovered by the Ottoman authorities, forcing it to start earlier. The first revolt began on 21 February 1821 in the Danubian Principalities, but it was soon put down by the Ottomans. These events urged Greeks in the Peloponnese into action and on 17 March 1821, the Maniots were first to declare war. In September 1821, the Greeks, under the leadership of Theodoros Kolokotronis, captured Tripolitsa. Revolts in Crete, Macedonia, and Central Greece broke out, but were suppressed. Greek fleets achieved success against the Ottoman navy in the Aegean Sea and prevented Ottoman reinforcements from arriving by sea. Tensions developed among Greek factions, leading to two consecutive civil wars. The Ottoman Sultan called in Muhammad Ali of Egypt, who agreed to send his son, Ibrahim Pasha, to Greece with an army to suppress the revolt in return for territorial gains. Ibrahim landed in the Peloponnese in February 1825 and brought most of the peninsula under Egyptian control by the end of that year. Though an Ottoman–Egyptian invasion of Mani failed, Athens fell, and revolutionary morale decreased. The three great powers—Russia, Britain, and France—decided to intervene, sending their naval squadrons to Greece in 1827. They destroyed the Ottoman–Egyptian fleet at the Battle of Navarino, and turned the tide in favor of the revolutionaries. In 1828, the Egyptian army withdrew under pressure from a French expeditionary force. The Ottoman garrisons in the Peloponnese surrendered and the Greek revolutionaries retook central Greece. The Ottoman Empire declared war on Russia allowing for the Russian army to move into the Balkans. This forced the Ottomans to accept Greek autonomy in the Treaty of Adrianople and semi-autonomy for Serbia and the Romanian principalities. After nine years of war, Greece was recognized as an independent state under the London Protocol of February 1830. Further negotiations in 1832 led to the London Conference and the Treaty of Constantinople, which defined the final borders of the new state and established Prince Otto of Bavaria as the first king of Greece. The slogan of the revolution, Eleftheria i thanatos 'Freedom or death', became Greece's national motto.

Missolonghi or Mesolongi is a town in western Greece. It is the capital of the Aetolia-Acarnania regional unit, and the seat of the municipality of Iera Polis Mesolongiou. According to the 2021 census, the municipality has a population of 32,048 people, of whom 13,965 live in the town of Missolonghi. Missolonghi is known as the site of a dramatic siege during the Greek War of Independence, which resulted in the death of poet Lord Byron.

Big Ben is the nickname for the Great Bell of the Great Clock of Westminster, and, by extension, for the clock tower that stands at the north end of the Palace of Westminster in London, England. Originally named the Clock Tower, the structure was renamed the Elizabeth Tower in 2012 to mark the Diamond Jubilee of Queen Elizabeth II. The clock is a striking clock with five bells.

Maximilian I (Spanish: Fernando Maximiliano José María de Habsburgo-Lorena; German: Ferdinand Maximilian Josef Maria von Habsburg-Lothringen; 6 July 1832 – 19 June 1867) was an Austrian archduke who became emperor of the Second Mexican Empire from 10 April 1864 until his execution by the Restored Republic of Mexico on 19 June 1867. A member of the House of Habsburg-Lorraine, Maximilian was the younger brother of Emperor Franz Joseph I of Austria. Before becoming Emperor of Mexico, he was commander-in-chief of the small Imperial Austrian Navy and briefly the Austrian viceroy of Lombardy–Venetia, but was removed by the emperor. Two years before his dismissal, he briefly met with French emperor Napoleon III in Paris, where he was approached by conservative Mexican monarchists seeking a European royal to rule Mexico. Initially Maximilian was not interested, but following his dismissal as viceroy, the Mexican monarchists' plan was far more appealing to him. Since Maximilian was a descendant of Charles V, Holy Roman Emperor, King of Spain when the Spaniards conquered the Aztecs (1519–21) and first brought Mexico into the Spanish Empire, a status it held until the Mexican independence in 1821, Maximilian seemed a perfect candidate for the conservatives' plans for monarchy in Mexico. Maximilian was interested in assuming the throne, but only with guarantees of French support. Mexican conservatives did not take sufficient account of Maximilian's embrace of liberalism, and Maximilian failed to understand he would be viewed as a foreign outsider. When Maximilian was first mentioned as a possible emperor of Mexico, the idea seemed far-fetched, but circumstances changed and made it viable. His tenure as emperor was just three years, ending with his execution by firing squad by forces of the Restored Republic on 19 June 1867. Political conflicts in Mexico in the 1850s between conservative and liberal factions were domestic disputes initially, but the conservatives' loss on the battlefield to the liberal regime during a three-year civil war (1858–61) meant conservatives sought ways to return to power with outside allies, opening a path for France under Napoleon III to intervene in Mexico and set up a puppet regime with conservative Mexican support. When the liberal government of Mexican president Benito Juárez suspended payment on foreign debts in 1861, there was an opening for European powers to intervene militarily in Mexico. The intention of the French and Mexican conservatives was for regime change to oust the liberals, backed by the power of the French army. Mexican monarchists sought a European head of state and, with the brokering of Napoleon III, Maximilian was invited to establish what would come to be known as the Second Mexican Empire. With a pledge of French military support and at the formal invitation of a Mexican delegation, Maximilian accepted the crown of Mexico on 10 April 1864 following a bogus referendum in Mexico that purportedly showed the Mexican people backed him. Maximilian's hold on power in Mexico was shaky from the beginning. Rather than enacting policies that would return power to Mexican conservatives, Maximilian instead sought to implement liberal policies, losing him his domestic conservative backers. Internationally, his legitimacy as ruler was in doubt since the United States continued to recognize Benito Juárez as the legal head of state rather than Emperor Maximilian. The U.S. saw the French invasion as a violation of the Monroe Doctrine, but the U.S. was unable to intervene politically due to the American Civil War (1861–1865). With the end of the American Civil War in 1865, the United States began providing material aid to Juárez's republican forces. In the face of a renewed U.S. interest in enforcing the Monroe Doctrine, under orders by Napoleon III, the French armies that had propped up Maximilian's regime began withdrawing from Mexico in 1866. With no popular support and republican forces in the ascendant, Maximilian's monarchy collapsed. Maximilian was captured in Querétaro. He was tried and executed by the restored Republican government alongside his generals Miguel Miramón, a former president of Mexico, and Tomás Mejía Camacho in June 1867. His death marked the end of monarchism as a major force in Mexico. In reassessments of his brief rule, he is portrayed in Mexican history less as the villain of nationalist, republican history and more as a liberal in Mexico, along with presidents of the Republic Juárez, Sebastián Lerdo de Tejada, and Porfirio Díaz.

The American Civil War (April 12, 1861 – May 26, 1865; also known by other names) was a civil war in the United States between the Union ("the North") and the Confederacy ("the South"), which was formed in 1861 by states that had seceded from the Union to preserve slavery in the United States. The South saw slavery as threatened because of the election of Abraham Lincoln and the growing abolitionist movement in the North. The war ended with Union victory, the dissolution of the Confederacy and the abolition of slavery, freeing four million African Americans. Decades of controversy over slavery came to a head when Abraham Lincoln, a Republican who opposed slavery's expansion, won the 1860 presidential election. Seven slave states in the South responded to Lincoln's victory by seceding from the United States and forming the Confederate States of America. The Confederacy seized US forts and other federal assets in the South. The war began on April 12, 1861, when the Confederacy bombarded Fort Sumter in South Carolina. A wave of enthusiasm for war swept over the North and South, as military recruitment soared. Four more Southern states seceded after the war began and, led by its president, Jefferson Davis, the Confederacy comprised eleven states, containing a third of the US population. Four years of intense combat, mostly in the South, ensued. During 1861–1862 in the western theater, the Union made permanent gains, though in the eastern theater the conflict was inconclusive. The abolition of slavery became a Union war goal on January 1, 1863, when Lincoln issued the Emancipation Proclamation, which declared all slaves in rebel states to be free, applying to more than 3.5 million of the 4 million enslaved people in the country. To the west, the Union first destroyed the Confederacy's river navy by the summer of 1862, then much of its western armies, and seized New Orleans. The successful 1863 Union siege of Vicksburg split the Confederacy in two at the Mississippi River, while Confederate general Robert E. Lee's incursion north failed at the Battle of Gettysburg. General Ulysses S. Grant's western successes led Lincoln to promote him to command of all Union armies in 1864. Inflicting an ever-tightening naval blockade of Confederate ports, the Union marshaled resources and manpower to attack the Confederacy from all directions. This led to the fall of Atlanta in 1864 to Union general William Tecumseh Sherman, followed by his March to the Sea, which culminated in his taking Savannah. The last significant battles raged around the ten-month siege of Petersburg, gateway to the Confederate capital of Richmond. The Confederates abandoned Richmond, and on April 9, 1865, Lee surrendered to Grant following the Battle of Appomattox Court House, setting in motion the end of the war. Lincoln lived to see this victory but was shot by an assassin on April 14, dying the next day. By the end of the war, much of the South's infrastructure had been destroyed. The Confederacy collapsed, the Thirteenth Amendment abolished slavery, and four million enslaved black people were freed. The war-torn nation then entered the Reconstruction era in an attempt to rebuild the country, bring the former Confederate states back into the United States, and grant civil rights to freed slaves. The war is one of the most extensively studied and written about episodes in the history of the United States. It remains the subject of cultural and historiographical debate. Of continuing interest is the myth of the Lost Cause of the Confederacy. The war was among the first to use industrial warfare. Railroads, the electrical telegraph, steamships, the ironclad warship, and mass-produced weapons were widely used. The war left an estimated 700,000 soldiers dead, along with an undetermined number of civilian deaths, making it the deadliest in American history. The technology and brutality of the Civil War foreshadowed the coming world wars.

Ethiopia, officially the Federal Democratic Republic of Ethiopia (FDRE), is a landlocked country located in the Horn of Africa region of East Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the southeast, Kenya to the south, South Sudan to the west, and Sudan to the northwest. Ethiopia covers a land area of 1,104,300 km2 (426,400 sq mi). As of 2026, it has around 138 million inhabitants, making it the 10th-most populous country in the world and 2nd most populous country in Africa. The national capital and largest city, Addis Ababa, lies several kilometres west of the East African Rift that splits the country into the African and Somali tectonic plates.

Arbor Day is a secular day of observance in which individuals and groups are encouraged to plant trees. Today, many countries observe such a holiday. Though usually observed in the spring, the date varies, depending on climate and suitable planting season.

Easter, also called Pasch or Pascha or Resurrection Sunday, is a Christian festival and cultural holiday commemorating the resurrection of Jesus from the dead, described in the Bible's New Testament as having occurred on the third day of his burial following his crucifixion by the Romans at Calvary c. 30 AD. It is the culmination of the Passion of Jesus, preceded by Lent, a 40-day period of fasting, prayer, and penance.

The 1896 Summer Olympics, officially known as the Games of the I Olympiad, and commonly known as Athens 1896 (Greek: Αθήνα 1896), were the first international Olympic Games held in modern history. Organised by the International Olympic Committee (IOC), which had been created by French aristocrat Pierre de Coubertin, the event was held in Athens, Greece, from 6 to 15 April 1896. Fourteen nations (according to the IOC, though the number is subject to interpretation) and 241 athletes (all males; this number is also disputed) took part in the games. Participants were all European or living in Europe, with the exception of the United States team, and over 65% of the competing athletes were Greek. Winners were given a silver medal, while runners-up received a copper medal. Retroactively, the IOC has designated the top three finishers in each event as gold, silver, and bronze medalists. Ten of the 14 participating nations earned medals. On April 6, 1896, American James Connolly became the first Olympic medalist in more than 1,500 years, competing in the triple jump. The United States won the most gold medals, 11, while host nation Greece won the most medals overall, 47. The highlight for the Greeks was the marathon victory by their compatriot Spyridon Louis. The most successful competitor was German wrestler and gymnast Carl Schuhmann, who won four events. Athens had been chosen to stage the inaugural modern Games during a congress organised by Coubertin in Paris on 23 June 1894, during which the IOC was also created. The main venue was the Panathenaic Stadium, where athletics and wrestling took place; other venues included the Neo Phaliron Velodrome for cycling and the Zappeion for fencing. The opening ceremony was held in the Panathenaic Stadium on 6 April, during which most of the competing athletes were aligned on the infield, grouped by nation. After a speech by the president of the organising committee, Crown Prince Constantine, his father officially opened the Games. Afterwards, nine bands and 150 choir singers performed an Olympic Hymn, composed by Spyridon Samaras and written by Kostis Palamas. The 1896 Olympics were regarded as a great success. The Games had the largest international participation of any sporting event to that date. The Panathenaic Stadium overflowed with the largest crowd ever to watch a sporting event. After the Games, Coubertin and the IOC were petitioned by several prominent figures, including Greece's King George and some of the American competitors in Athens, to hold all the following Games in Athens. However, the 1900 Summer Olympics were already planned for Paris, and, with the exception of the Intercalated Games of 1906, the Olympics did not return to Greece until the 2004 Summer Olympics, 108 years later.

RMS Titanic was a British ocean liner that sank in the early hours of 15 April 1912 after striking an iceberg on her maiden voyage from Southampton, England, to New York City. Of the 2,208 passengers and crew aboard, approximately 1,500 died (estimates vary), making the incident one of the deadliest peacetime sinkings of a single ship. Titanic, operated by White Star Line, carried some of the wealthiest people in the world, as well as hundreds of emigrants from the British Isles, Scandinavia, and elsewhere in Europe who were seeking a new life in the United States and Canada. The disaster drew public attention, spurred major changes in maritime safety regulations, and inspired a lasting legacy in popular culture. It was the second time White Star Line had lost a ship on her maiden voyage, the first being RMS Tayleur in 1854. Titanic was the largest ship afloat upon entering service and the second of three Olympic-class ocean liners built for White Star Line. The ship was built by the Harland and Wolff shipbuilding company in Belfast. Thomas Andrews Jr., the chief naval architect of the shipyard, died in the disaster. Titanic was under the command of Captain Edward John Smith, who went down with the ship. White Star Line's chairman, J. Bruce Ismay, survived in a lifeboat. The first-class accommodations were designed to be the pinnacle of comfort and luxury. They included a gymnasium, swimming pool, smoking rooms, fine restaurants and cafes, a Victorian-style Turkish bath, and hundreds of opulent cabins. A high-powered radiotelegraph transmitter was available for passenger use. Titanic had advanced safety features, such as watertight compartments and remotely activated watertight doors, which contributed to the ship's reputation as "unsinkable". Titanic was equipped with sixteen lifeboat davits, each capable of lowering three lifeboats, for a total capacity of 48 boats. Despite this capacity, the ship was equipped with twenty lifeboats. Fourteen of these were regular lifeboats, two were cutter lifeboats, and four were collapsible boats that proved difficult to prepare for launch while the ship was sinking. Together, these lifeboats could have held 1,178 people – roughly half the number of passengers on board, and a third of the number that the ship could have carried at full capacity (a number consistent with the maritime safety regulations of the era). The British Board of Trade's regulations required fourteen lifeboats for a ship of 10,000 tonnes. Titanic carried six more than that, room for 338 more people than the standard. When the ship sank, the lifeboats that had been lowered were carrying an average of 60% of their rated capacity.

The Mexican Revolution was an extended sequence of armed regional conflicts in Mexico from 20 November 1910 to 1 December 1920. It has been called "the defining event of modern Mexican history". It saw the destruction of the Federal Army, its replacement by a revolutionary army, and the transformation of Mexican culture and government. The northern Constitutionalist faction prevailed on the battlefield and drafted the present-day Constitution of Mexico, which aimed to create a strong central government. Revolutionary generals held power from 1920 to 1940. The revolutionary conflict was primarily a civil war, but foreign powers, having important economic and strategic interests in Mexico, figured in the outcome of Mexico's power struggles; the U.S. involvement was particularly high. The conflict led to the deaths of around one million people, mostly non-combatants.

The Regional Congresses of Peasants, Workers and Insurgents represented the "highest form of democratic authority" within the political system of the Makhnovshchina. They brought together delegates from the region's peasantry, industrial workers and insurgent soldiers, which would discuss the issues at hand and take their decisions back with them to local popular assemblies.

Volgograd, formerly Tsaritsyn (1589–1925) and Stalingrad (1925–1961), is the administrative centre and largest city of Volgograd Oblast, Russia. The city lies on the western bank of the Volga, covering an area of 859.4 square kilometres, with a population of slightly over one million residents. Volgograd is the 16th-largest city by population size in Russia, the third-largest city of the Southern Federal District, and the fourth-largest city on the Volga.

World War II, or the Second World War, was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many engaging in total war on an unprecedented scale. World War II was the deadliest conflict in history, causing the deaths of 60 to 75 million people, a majority of whom were civilians. Millions died as a result of massacres, starvation, disease, and genocides including the Holocaust. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

Rudolf Vrba was a Slovak-Jewish biochemist who, as a teenager in 1942, was deported to the Auschwitz concentration camp in German-occupied Poland. He escaped from the camp in April 1944, at the height of the Holocaust, and co-wrote the Vrba-Wetzler report, a detailed report about the mass murder taking place there. The report, distributed by George Mantello in Switzerland, is credited with having halted the mass deportation of Hungary's Jews to Auschwitz in July 1944, saving more than 200,000 lives. After the war, Vrba trained as a biochemist, working mostly in England and Canada.

A submarine is a watercraft capable of independent operation underwater. The term "submarine" is also sometimes used historically or informally to refer to remotely operated vehicles and robots, or to medium-sized or smaller vessels. Submarines are referred to as boats rather than ships regardless of their size.

TEV Wahine was a twin-screw, turbo-electric, roll-on/roll-off passenger ferry. Ordered in 1964, the vessel was built by the Fairfield Shipbuilding and Engineering Company, in Govan, Glasgow, Scotland for the Union Steam Ship Company's Wellington-Lyttelton Steamer Express Service in New Zealand.

Sir James Paul McCartney is an English musician and songwriter. He gained global fame with the Beatles, for whom he was the bassist and keyboardist, and shared primary songwriting and lead vocal duties with John Lennon. McCartney is known for his melodic approach to bass-playing, versatile tenor vocal range and musical eclecticism, exploring genres ranging from pre–rock and roll pop to classical, ballads and electronica. His songwriting partnership with Lennon remains the most successful in music history.

The Yinqueshan Han Tombs Bamboo Slips Museum is a museum dedicated to archaeological finds from two Western Han dynasty tombs excavated on site in Lanshan District, Linyi City, Shandong Province, China.

The Vietnam War was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam and South Vietnam and their allies. North Vietnam was supported by the Soviet Union and China, while South Vietnam was supported by the United States and other anti-communist nations. The conflict was the second of the Indochina wars and a proxy war of the Cold War. The Vietnam War was one of the postcolonial wars of national liberation, a theater in the Cold War, and a civil war, with civil warfare a defining feature from the outset. Direct US military involvement escalated from 1965 until US forces were withdrawn in 1973. The fighting spilled into the Laotian and Cambodian civil wars, which ended with all three countries becoming communist in 1975.

Invicta International Airlines Flight 435 (IM435) was a Vickers Vanguard 952, flying from Bristol Lulsgate to Basel-Mulhouse, which crashed into a forested hillside near Hochwald, Switzerland on 10 April 1973. The aircraft somersaulted and broke up, killing 108 people, with 37 survivors. To date, this is the deadliest accident involving a Vickers Vanguard and the deadliest aviation accident to occur on Swiss soil. Many of the 139 passengers on the charter flight were women, members of the Axbridge Ladies Guild, from the Somerset towns and villages of Axbridge, Cheddar, Winscombe and Congresbury. The accident left 55 children motherless and became known in the British media as the Basle air crash.

On Tuesday, April 10, 1979, a widespread and destructive outbreak of severe weather impacted areas near the Red River between Oklahoma and Texas. Thunderstorms developed over West and North Central Texas during the day within highly unstable atmospheric conditions following the northward surge of warm and moist air into the region, producing large hail, strong winds, and multiple tornadoes. At least 22 tornadoes were documented on April 10, of which two were assigned an F4 rating on the Fujita scale; four of the tornadoes caused fatalities.

The Provisional Irish Republican Army, officially known as the Irish Republican Army and informally known as the Provos, was an Irish republican paramilitary force that sought to end British rule in Northern Ireland, facilitate Irish reunification and bring about an independent socialist republic, which would encompass all of Ireland. It was the most active republican paramilitary group during the Troubles. It argued that the all-island Irish Republic continued to exist, and it saw itself as that state's army, the sole legitimate successor to the original IRA from the Irish War of Independence. It was designated a terrorist organisation in the United Kingdom and an unlawful organisation in the Republic of Ireland, both of whose authority it rejected.

The Moby Prince disaster was a major maritime accident resulting in 140 deaths. It occurred in the late evening of Wednesday 10 April 1991, in the harbour of Livorno, Italy. It is the worst disaster in the Italian merchant navy since World War II. It is also considered one of the two worst environmental disasters in Italian history, along with the explosion and loss of the tanker Amoco Milford Haven on the following day in an unrelated accident near Voltri.

South Atlantic tropical cyclones are unusual weather events that occur in the Southern Hemisphere. Strong wind shear, which disrupts the formation of cyclones, as well as a lack of weather disturbances favorable for development in the South Atlantic Ocean, make any strong tropical system extremely rare, and Hurricane Catarina in 2004 is the only recorded South Atlantic hurricane in history. Storms can develop year-round in the South Atlantic, with activity peaking during the months from November through May. Since 2011, the Brazilian Navy Hydrographic Center has assigned names to tropical and subtropical systems in the western side of the basin, near the eastern coast of Brazil, when they have sustained wind speeds of at least 65 km/h (40 mph), the generally accepted minimum sustained wind speed for a disturbance to be designated as a tropical storm in the North Atlantic basin. Below is a list of notable South Atlantic tropical and subtropical cyclones.

The Polish Air Force is the aerial warfare branch of the Polish Armed Forces. Until July 2004 it was officially known as Wojska Lotnicze i Obrony Powietrznej. In 2014 it consisted of roughly 26,000 military personnel and about 475 aircraft, distributed among ten bases throughout Poland.

On 10 April 2016 at approximately 03:30 am IST, the Puttingal Temple in Paravur, Kollam, Kerala, India, experienced a fireworks accident after firework celebrations went awry. As a result, 111 people were killed and more than 350 were injured, including some with severe burns. The temple and at least 150 houses in the area of the temple were damaged by the blast. According to local reports and eyewitnesses, the explosion and fire were caused by sparks from a firecracker being used in a competitive fireworks display igniting fireworks in a concrete storehouse. About 15,000 pilgrims were visiting the temple to mark local Hindu celebrations during the last day of a seven-day festival of the goddess Bhadrakali.

On April 10, 2023, a mass shooting occurred at an Old National Bank branch in Louisville, Kentucky, United States. Five people were killed, and eight others were injured, including two responding police officers. The shooter, 25-year-old former employee Connor James Sturgeon, was fatally shot by police at the scene.