April 17 in History

Harald Hen (Runic Danish for "Harald the Whetstone"; c. 1040 – 17 April 1080) was King of Denmark from 1076 to 1080. Harald III was an illegitimate son of Danish king Sweyn II Estridsson, and contested the crown with some of his brothers. He was a peaceful ruler who initiated a number of reforms. Harald was married to his cousin Margareta Hasbjörnsdatter, but did not leave any heirs, and was succeeded by his brother Canute IV the Saint. Four of his half-brothers were in turn crowned Danish kings.

The Bavand dynasty (Persian: باوندیان) (also spelled Bavend), or simply the Bavandids, was an Iranian dynasty that ruled in parts of Tabaristan (present-day Mazandaran province) in what is now northern Iran from 651 until 1349, alternating between outright independence and submission as vassals to more powerful regional rulers. They ruled for 698 years, which is the second longest dynasty of Iran after the Baduspanids.

Kaunas Castle is a medieval castle in Kaunas, the second-largest city in Lithuania. Archeological evidence suggests that it was built during the mid-14th century in the Gothic style. Its site is strategic—a rise on the banks of the Nemunas River near its confluence with the Neris River. As of the 21st century, roughly one-third of the original castle remains.

Christopher Columbus was an Italian explorer and navigator from the Republic of Genoa who completed four Spanish transatlantic voyages in the name of the Catholic Monarchs, opening the way for the widespread European exploration and colonization of the Americas. His expeditions were the first known European contact with the Caribbean and Central and South America.

Martin Luther was a German priest, theologian, author, hymnwriter, professor, and former Augustinian friar. Luther was the seminal figure of the Protestant Reformation, and his theological beliefs form the basis of Lutheranism. He is considered one of the most influential figures in Western and Christian history.

Giovanni da Verrazzano was an Italian explorer from the Republic of Florence, best known for his expedition to North America. He led most of his later missions, including the one to America, in the service of King Francis I of France.

The American Revolutionary War (April 19, 1775 – September 3, 1783), also known as the Revolutionary War or American War of Independence or simply the American Revolution, was the armed conflict that comprised the final eight years of the broader American Revolution, in which American Patriot forces organized as the Continental Army and, commanded by George Washington, defeated the British Army. The conflict was fought in North America, the Caribbean, and the Atlantic Ocean. The war's outcome seemed uncertain for most of the war, but Washington and the Continental Army's decisive victory in the Siege of Yorktown in 1781 led King George III and the Kingdom of Great Britain to negotiate an end to the war. In 1783, in the Treaty of Paris, the British monarchy acknowledged the independence of the Thirteen Colonies, leading to the establishment of the United States as an independent and sovereign nation. In 1763, after the British Empire gained dominance in North America following its victory over the French in the Seven Years' War, tensions and disputes began escalating between the British and the Thirteen Colonies, especially following passage of the Stamp and Townshend Acts. The British Army responded by seeking to occupy Boston militarily, leading to the Boston Massacre on March 5, 1770. In mid-1774, with tensions escalating even further between the British Army and the colonies, the British Parliament imposed the Intolerable Acts, an attempt to disarm Americans, leading to the Battles of Lexington and Concord in April 1775, the first battles of the Revolutionary War. In June 1775, the Second Continental Congress voted to incorporate colonial-based Patriot militias into a central military, the Continental Army, and unanimously appointed Washington its commander-in-chief. Two months later, in August 1775, George III declared the colonies to be in a state of rebellion. In July 1776, the Second Continental Congress formalized the war, passing the Lee Resolution on July 2, and, two days later, unanimously adopting the Declaration of Independence, on July 4. In March 1776, in an early win for the newly-formed Continental Army under Washington's command, following a successful siege of Boston, the Continental Army successfully drove the British Army out of Boston. British commander in chief William Howe responded by launching the New York and New Jersey campaign, which resulted in Howe's capture of New York City in November. Washington responded by clandestinely crossing the Delaware River and winning small but significant victories at Trenton and Princeton. In the summer of 1777, as Howe was poised to capture Philadelphia, the Continental Congress fled to Baltimore. In October 1777, a separate northern British force under the command of John Burgoyne was forced to surrender at Saratoga in an American victory that proved crucial in convincing France and Spain that an independent United States was a viable possibility. France signed a commercial agreement with the revolutionaries, followed by a Treaty of Alliance in February 1778. In 1779, the Sullivan Expedition undertook a scorched earth campaign against British-allied factions of the Haudenosaunee Confederacy (also Iroquois). Native American raids on the American frontier, however, continued to be a problem. Also, in 1779, Spain allied with France against Great Britain in the Treaty of Aranjuez, though Spain did not formally ally with the Americans. Howe's replacement Henry Clinton intended to take the war against the Americans into the Southern Colonies. Despite some initial success, British General Cornwallis was besieged by a Franco-American army in Yorktown, Virginia, in September and October 1781. The French navy cut off Cornwallis's escape and he was forced to surrender in October. The British wars with France and Spain continued for another two years, but fighting largely ceased in North America. In the Treaty of Paris, signed on September 3, 1783, Great Britain acknowledged the sovereignty and independence of the United States, bringing the American Revolutionary War to an end. The Treaties of Versailles resolved Great Britain's conflicts with France and Spain, and forced Great Britain to cede Tobago, Senegal, and small territories in India to France, and Menorca, West Florida, and East Florida to Spain.

Lieutenant-General Sir Ralph Abercromby (7 October 1734 – 28 March 1801) was a British Army officer, politician and colonial administrator who served as the governor of Trinidad in 1797. Rising to the rank of lieutenant general in the British army, he was commander-in-chief, Ireland, and was noted for his military service during the French Revolutionary Wars, which included defeating the French invasion of Egypt and Syria.

Verona is the largest city in the region of Veneto in Italy, with a population of 255,139 as of 2026. It is one of the seven provincial capitals of the region, and is also the 2nd-largest city in northeast Italy. The metropolitan area of Verona covers an area of 1,426 km2 (550.58 sq mi) and has a population of 714,310 inhabitants. It is one of the main tourist destinations in Northern Italy because of its artistic heritage and several annual fairs and shows as well as the opera season in the Arena, an ancient Roman amphitheater.

Virginia, officially the Commonwealth of Virginia, is a state in the Southeastern and Mid-Atlantic regions of the United States between the Atlantic Coast and the Appalachian Mountains. It borders Kentucky to the west, Tennessee to the south-west, North Carolina to the south, West Virginia to the north-west, and Maryland to the north. The state's capital is Richmond and its most populous city is Virginia Beach. With a population of 8.8 million, it is the 12th-most populous and 15th-most densely populated state. More than one-third of Virginia's population lives in Northern Virginia, which includes the most populous jurisdiction in the state, Fairfax County.

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.

The Battle of Plymouth was an engagement during the American Civil War that was fought from April 17 through April 20, 1864, in the city of Plymouth and surrounding Washington County, North Carolina.

Morelos, officially the Free and Sovereign State of Morelos, is a landlocked state located in south-central Mexico. It is one of the 32 states which comprise the Federal Entities of Mexico. It is divided into 36 municipalities and its capital city is Cuernavaca. Morelos is bordered by Mexico City to the north, and by the states of México to the northeast and northwest, Puebla to the east and Guerrero to the southwest. Morelos is the second-smallest state in the nation, just after Tlaxcala. It was part of a very large province, the State of Mexico, until 1869 when President Benito Juárez decreed that its territory would be separated and named in honor of José María Morelos y Pavón, who defended the city of Cuautla from royalist forces during the Mexican War of Independence. Most of the state enjoys a warm climate year-round, which is good for the raising of sugar cane and other crops. Morelos has attracted visitors from the Valley of Mexico since Aztec times. The state is also known for the Chinelos, a type of costumed dancer that appears at festivals, especially Carnival, which is celebrated in a number of communities in the state. It is also home to the Monasteries on the slopes of Popocatépetl, a designated World Heritage Site.

The Catalpa rescue was the escape, on 17–19 April 1876, of six Irish Fenian prisoners from the Convict Establishment (now Fremantle Prison), a British penal colony in Western Australia. They were taken on the convict ship Hougoumont to Fremantle, Western Australia, arriving 9 January 1868. In 1869, pardons had been issued to many of the imprisoned Fenians. Another round of pardons was issued in 1871, after which only a small group of "military" Fenians remained in Western Australia's penal system. In 1874, prisoner James Wilson secretly sent a letter to New York City journalist John Devoy, who worked to organize a rescue. Using donations collected by Devoy from Irish-Americans, Fremantle escapee John Boyle O'Reilly, then living in Boston, purchased a merchant ship, Catalpa, and sailed her to international waters off Rockingham, Western Australia. On 17 April 1876 at 8:30 am, Wilson and five other Fenians working outside the prison walls, Thomas Darragh, Martin Hogan, Michael Harrington, Thomas Hassett, and Robert Cranston, boarded a whaleboat O'Reilly had dispatched, were taken aboard Catalpa, and escaped to New York.

The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on questions of U.S. constitutional or federal law. It also has original jurisdiction over a narrow range of cases, specifically "all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party". In 1803, the court asserted the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution. It is also able to strike down presidential directives for violating either the Constitution or statutory law.

Ellis Island is an island in New York Harbor, within the U.S. states of New Jersey and New York. Owned by the U.S. government, Ellis Island was the busiest immigrant inspection and processing station in the United States. From 1892 to 1954, about 12 million immigrants arriving at the Port of New York and New Jersey were processed there; according to one estimate, two-fifths of Americans may be descended from these immigrants. It has been part of the Statue of Liberty National Monument since 1965 and is accessible to the public only by ferry. The north side of the island is a national museum of immigration, while the south side of the island, including the Ellis Island Immigrant Hospital, is open to the public through guided tours.

The Russian Empire was an empire that extended across northern Eurasia from 1721 until the proclamation of the Russian Republic in 1917, forming the final era of Tsarist Russia and the wider Russian monarchy. At its height in the late 19th century, it covered about 22,800,000 km2 (8,800,000 sq mi), roughly one-sixth of the world's landmass, making it the third-largest empire in history, behind only the British and Mongol empires. The 1897 Russian census found a population of 126 million with considerable ethnic, linguistic, religious, and socioeconomic diversity.

The Communist Party of Korea (Korean: 조선공산당; Hanja: 朝鮮共產黨; MR: Chosŏn Kongsandang) was a Marxist-Leninist party in Korea founded during a secret meeting in Seoul in 1925. The Governor-General of Korea had banned communist and socialist parties under the Peace Preservation Law so the party had to operate in a clandestine manner. The leaders of the party were Kim Yong-bom and Pak Hon-yong. After Kim Il Sung transformed the northern branch of the party into the Communist Party of North Korea, he led the foundation of the Workers' Party of North Korea. Pak Hon-yong led the foundation of the Workers' Party of South Korea.

The Catalan Republic (Catalan: República Catalana, IPA: [rəˈpubːlikə kətəˈlanə]) was a state proclaimed in 1931 by Francesc Macià as the "Catalan Republic within the Iberian Federation", in the context of the proclamation of the Second Spanish Republic. It was proclaimed on 14 April 1931, and superseded three days later, on 17 April, by the Generalitat de Catalunya, the Catalan institution of self-government within the Spanish Republic.

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.

A prisoner of war (POW) is a person held captive by a belligerent power during or immediately after an armed conflict. The earliest recorded usage of the phrase "prisoner of war" dates back to 1610.

The Greek People's Liberation Army (Greek: Ελληνικός Λαϊκός Απελευθερωτικός Στρατός (ΕΛΑΣ), Ellinikós Laïkós Apeleftherotikós Stratós), known mostly by its acronym ELAS, was the largest and most significant military organization of the Greek resistance during World War II. It was the military arm of the National Liberation Front, a left-wing group whose main driving force was the Communist Party of Greece, during the period of the Greek resistance against the Axis occupation of Greece. It was disarmed and disbanded in February 1945, following the Dekemvriana clashes and the Varkiza Agreement.

Montese is a town and comune (municipality) in the Province of Modena, Emilia-Romagna, northern Italy. It is located in the Modenese Apennines, south of Modena, in a mountain area overlooking the upper Panaro valley.

Trần Trọng Kim (Vietnamese: [t͡ɕən˨˩ t͡ɕawŋ͡m˧˨ʔ kim˧˧]; chữ Hán: 陳仲金, Kanji pronunciation: Chin Jūkin; Japanese: チャン・チョン・キム, romanized: Chan Chon Kimu; 1883 – December 2, 1953; courtesy name Lệ Thần ([le˧˨ʔ tʰən˨˩], chữ Hán: 隸臣) was a Vietnamese scholar and politician who served as the Prime Minister of the short-lived Empire of Vietnam, a state established with the support of Imperial Japan in 1945 after Japan had seized direct control of Vietnam from Vichy France toward the end of World War II. He was an uncle of Bùi Diễm.

Independence Day is Syria's National Day commemorating the evacuation of the last French soldier at the end of the French mandate of Syria on 17 April 1946 after Syria's proclamation of full independence on 27 September 1941.

The Peak District is an upland area in central-northern England, at the southern end of the Pennines. Mostly in Derbyshire, it extends into Cheshire, Greater Manchester, Staffordshire, West Yorkshire and South Yorkshire. It is subdivided into the Dark Peak, moorland dominated by gritstone, and the White Peak, a limestone area with valleys and gorges. The Dark Peak forms an arc on the north, east and west of the district, and the White Peak covers central and southern areas. The highest point is Kinder Scout. Most of the area is within the Peak District National Park, a protected landscape designated in 1951.

The Bay of Pigs Invasion, also known as Playa Girón in Cuba, after the beach where the battle took place, was a failed military landing operation on the southwestern coast of Cuba in April 1961 by the United States and the Cuban Democratic Revolutionary Front (DRF), consisting of Cuban exiles who opposed Fidel Castro's Cuban Revolution, clandestinely and directly financed by the U.S. government. The operation took place at the height of the Cold War, and its failure influenced relations between Cuba, the United States, and the Soviet Union. By early 1960, President Dwight D. Eisenhower had begun contemplating ways to remove Castro. In accordance with this goal, Eisenhower eventually approved Richard Bissell's plan which included training the paramilitary force that would later be used in the Bay of Pigs Invasion. Alongside covert operations, the U.S. also began its embargo of the island. This led Castro to reach out to the U.S.'s Cold War rival, the Soviet Union, after which the U.S. severed diplomatic relations. Cuban exiles who had moved to the U.S. following Castro's takeover had formed the counter-revolutionary military unit Brigade 2506, which was the armed wing of the DRF. The CIA funded the brigade, which also included approximately 60 members of the Alabama Air National Guard, and trained the unit in Guatemala. Over 1,400 paramilitaries, divided into five infantry battalions and one paratrooper battalion, assembled and launched from Guatemala and Nicaragua by boat on 17 April 1961. Two days earlier, eight CIA-supplied B-26 bombers had attacked Cuban airfields and then returned to the U.S. On the night of 17 April, the main invasion force landed on the beach at Playa Girón in the Bay of Pigs, where it overwhelmed a local revolutionary militia. Initially, José Ramón Fernández led the Cuban Revolutionary Army counter-offensive; later, Castro took personal control. As the invasion force lost the strategic initiative, the international community found out about the invasion, and U.S. president John F. Kennedy decided to withhold further air support. The plan, devised during Eisenhower's presidency, had required the involvement of U.S. air and naval forces. Without further air support, the invasion was being conducted with fewer forces than the CIA had deemed necessary. The invading force was defeated within three days by the Cuban Revolutionary Armed Forces (Spanish: Fuerzas Armadas Revolucionarias; FAR) and surrendered on 20 April. Most of the surrendered counter-revolutionary troops were publicly interrogated, incarcerated into Cuban prisons and subsequently prosecuted and tried. The invasion was a U.S. foreign policy failure. The Cuban government's victory solidified Castro's role as a national hero and widened the political division between the two formerly friendly countries, as well as emboldened other Latin American groups to undermine U.S. influence in the region. As stated in a memoir from Chester Bowles: "The humiliating failure of the invasion shattered the myth of a New Frontier run by a new breed of incisive, fault-free supermen. However costly, it may have been a necessary lesson." It also pushed Cuba closer to the Soviet Union, setting the stage for the Cuban Missile Crisis in 1962.

Geraldine "Jerrie" Fredritz Mock (November 22, 1925 – September 30, 2014) was an American pilot and the first woman to fly solo around the world. She flew a single-engine Cessna 180 (registered N1538C) christened the Spirit of Columbus and nicknamed "Charlie." The trip began March 19, 1964, in Columbus, Ohio, and ended April 17, 1964, in Columbus. It took 29 days, 11 hours and 59 minutes, with 21 stopovers and covered almost 22,860 miles (36,790 km). During the journey, Mock became the first woman to fly solo across the Pacific Ocean from west to east and the first woman to fly a single-engine plane in either direction across the Pacific. The flight was part of a "race" that developed between Jerrie Mock and Joan Merriam Smith who had flown from a field near San Francisco, CA on March 17, 1964; Smith's departure date and flight path was the same as the aviator Amelia Earhart's last flight. Mock finished first. In 1970 Mock published the story of her round-the-world flight in the book Three-Eight Charlie. While that book is now out of print, a 50th anniversary edition was later published including maps, weather charts and photos. Three-Eight Charlie is a reference to the tail number, N1538C, of the Cessna 180 Skywagon Mock used to fly around the world. Before her death, Mock, mother of three children, resided in Quincy, Florida, northwest of the state capital, Tallahassee.

Sirhan Bishara Sirhan is a Palestinian-Jordanian man who assassinated U.S. attorney general and senator Robert F. Kennedy, the younger brother of U.S. president John F. Kennedy and a candidate for the Democratic nomination in the 1968 United States presidential election on June 5, 1968. Sirhan was 24 years old at the time. On April 17, 1969, he was convicted of first-degree murder, among other charges. He was subsequently sentenced to death by gas chamber. In 1972, this was commuted to a life sentence in the aftermath of People v. Anderson. The circumstances surrounding the attack, which took place five years after President Kennedy's assassination, have led to numerous conspiracy theories.

The Communist Party of Czechoslovakia was a communist and Marxist–Leninist political party in Czechoslovakia that existed between 1921 and 1992. It was a member of the Comintern. Between 1929 and 1953, it was led by Klement Gottwald. The KSČ was the sole governing party in the Czechoslovak Socialist Republic though it was a leading party along with the Slovak branch and four other legally permitted non-communist parties. After its election victory in 1946, it seized power in the 1948 Czechoslovak coup d'état and established a one-party state allied with the Soviet Union. Nationalization of virtually all private enterprises followed, and a planned economy was implemented.

The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which landed the first humans on the Moon in 1969. The Apollo program was conceived in 1960 in the Dwight D. Eisenhower presidency during Project Mercury and executed after Project Gemini. The Apollo program was later dedicated to President John F. Kennedy's national goal, "before this decade is out, of landing a man on the Moon and returning him safely to the Earth" in his address to the U.S. Congress on May 25, 1961.

The Provisional Government of Bangladesh, popularly known as the Mujibnagar Government and also known as the Bangladeshi government-in-exile, was the first and founding government of Bangladesh that was established following the proclamation of independence of East Pakistan as Bangladesh on 10 April 1971. Headed by prime minister Tajuddin Ahmad, it was the supreme leadership of the liberation movement, comprising a cabinet, a diplomatic corps, an assembly, an armed force, and a radio service. It operated as a government-in-exile from Kolkata. The president of this government was Sheikh Mujibur Rahman, who is the main undisputed figure here; however, in his absence, Syed Nazrul Islam became the acting president.

The Cambodian Civil War was a civil war in Cambodia fought between the Khmer Rouge against the government of the Kingdom of Cambodia. Following the March 1970 coup, the conflict shifted as the Khmer Rouge and forces loyal to Norodom Sihanouk, now supported by North Vietnam and China, fought against the Khmer Republic, which was supported by the United States and South Vietnam.

The Three Hundred and Thirty-Five Years' War was an alleged state of war between the Netherlands and the Isles of Scilly. It is said to have been extended by the lack of a peace treaty for 335 years without a single shot being fired, which would make it one of the world's longest wars, and a bloodless war. Despite the uncertain validity of the declaration of war, and thus uncertainty about whether or not a state of war ever actually existed, peace was finally declared in 1986, bringing an end to any hypothetical war that may have been legally considered to exist.

Space Shuttle Columbia (OV-102) was a Space Shuttle orbiter manufactured by Rockwell International and operated by NASA. Named after the first American ship to circumnavigate the globe, and the female personification of the United States, Columbia was the first of five Space Shuttle orbiters to fly in space, debuting the Space Shuttle launch vehicle on its maiden flight on April 12, 1981 and becoming the first spacecraft to be re-used after its first flight when it launched on STS-2 on November 12, 1981. As only the second full-scale orbiter to be manufactured after the Approach and Landing Test vehicle Enterprise, Columbia retained unique external and internal features compared with later orbiters, such as test instrumentation and distinctive black chines. In addition to a heavier aft fuselage and the retention of an internal airlock throughout its lifetime, these made Columbia the heaviest of the five spacefaring orbiters: around 1,000 kilograms heavier than Challenger and 3,600 kilograms heavier than Endeavour when originally constructed. Columbia also carried ejection seats based on those from the SR-71 during its first six flights until 1983, and from 1986 onwards carried an imaging pod on its vertical stabilizer.

Anneli Tuulikki Jäätteenmäki is a Finnish politician who was the first female and 39th prime minister of Finland from 17 April 2003 to 24 June 2003. From 2004 until 2019, she served as a Member of the European Parliament (MEP) from Finland.

Palestinians are an Arab national group native to the region of Palestine, descended from those who have inhabited the area over the millennia. They represent a highly homogenized community who share a cultural and ethnic identity, and close linguistic and cultural ties with other Levantine Arabs.

On April 17, 2013, an ammonium nitrate explosion occurred at the West Fertilizer Company storage and distribution facility in West, Texas, United States, while emergency services personnel were responding to a fire there. Fifteen people were killed, over 160 injured, and more than 150 buildings damaged or destroyed. Investigators confirmed that ammonium nitrate was the material that exploded. On May 11, 2016, the Bureau of Alcohol, Tobacco, Firearms and Explosives stated that the fire was deliberately set. That finding has been disputed.

On 8 April 2013, former British prime minister Margaret Thatcher, Baroness Thatcher, died of a stroke at the Ritz Hotel, London, at the age of 87. On 17 April, she was honoured with a ceremonial funeral. Due to polarised opinions about her achievements and legacy, the reaction to her death was mixed across the UK, including contrasting praise, criticism, and celebrations of her life as well as celebrations of her death.

The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the United States' civil space program, as well as research in aeronautics and space. Headquartered in Washington, D.C., NASA operates ten field centers across the US and is organized into three mission directorates: Human Spaceflight, Research and Technology, and Science. Established in 1958 amid the Space Race, NASA succeeded the National Advisory Committee for Aeronautics (NACA) to give the US space program a distinct civilian orientation focused on peaceful applications. Since then, it has led most American spaceflight programs, including Project Mercury, Project Gemini, the Apollo program, Skylab, the Space Shuttle, the International Space Station (ISS), and the ongoing multinational Artemis program.

On 9 April 2021, Prince Philip, Duke of Edinburgh, the husband of Queen Elizabeth II of the United Kingdom and the other Commonwealth realms, and the longest-serving royal consort in history, died of old age at Windsor Castle at the age of 99.