September 4 in History

Romulus Augustus, nicknamed Augustulus, was Roman emperor of the West from 31 October 475 until 4 September 476. Romulus was placed on the imperial throne while still a minor by his father Orestes, the magister militum, for whom he served as little more than a figurehead. After a rule of ten months, the barbarian general Odoacer defeated and killed Orestes and deposed Romulus. As Odoacer did not proclaim any successor, Romulus is typically regarded as the last Western Roman emperor, his deposition marking the end of the Western Roman Empire as a political entity. The deposition of Romulus Augustulus is also sometimes used by historians to mark the transition from antiquity to the medieval period.

The Battle of Lenzen was a land battle between a Saxon army of the Kingdom of Germany and the armies of the Slavic Redarii and Linonen peoples, that took place on 4 September 929 near the fortified Linonen stronghold of Lenzen in Brandenburg, Germany. The Saxon army, commanded by Saxon magnate Bernhard, destroyed a Slavic Redarii army. It marked the failure of Slavic attempts to resist German king Henry the Fowler's expansionism to the Elbe.

Peter III of Aragon was King of Aragon, King of Valencia, and Count of Barcelona from 1276 to his death. At the invitation of some rebels, he conquered the Kingdom of Sicily and became King of Sicily in 1282, pressing the claim of his wife, Constance II of Sicily, uniting the kingdom to the crown.

The Flight of the Earls took place on 14 September [O.S. 4 September] 1607, when Irish earls Hugh O'Neill, Earl of Tyrone, and Rory O'Donnell, Earl of Tyrconnell, permanently departed Rathmullan in Ireland for Catholic Europe during a period of extreme political tension with the English Crown. The Flight's exact motivation is unclear and the subject of debate. They were accompanied by their extended families, retinue, followers and fellow nobility, numbering about 100 people. The earls were patriarchs of the two most powerful clans in Ulster—the O'Neill and O'Donnell clans—and their emigration is considered to symbolise the end of Gaelic Irish society. The earls' lands were later escheated and settled by Protestants from Great Britain as part of the Plantation of Ulster.

New Caledonia is a French territory consisting of a group of islands in the southwest Pacific Ocean, 220 km (140 mi) southwest of Vanuatu and 1,210 km (750 mi) east of Australia. Located 16,100 km (10,000 mi) from Metropolitan France, it forms a sui generis collectivity of the French Republic, having a unique legal status enshrined in a dedicated chapter of the French Constitution.

The Coup of 18 Fructidor, Year V, was a seizure of power in France by members of the Directory, then forming the government of the First French Republic, with support from the military. The coup was provoked by the results of elections held months earlier, which had given the majority of seats in the country's Corps législatif to royalist candidates, threatening a restoration of the monarchy and a return to the ancien régime. Three of the five members of the Directory, Paul Barras, Jean-François Rewbell and Louis Marie de La Révellière-Lépeaux, with support of foreign minister Charles Maurice de Talleyrand-Périgord, staged the coup d'état that annulled many of the previous election's results and ousted the monarchists from the legislature.

The War of 1812 was a conflict initiated by the United States against the United Kingdom and its allies fought mainly in North America and at sea during the wider Napoleonic Wars. The United States declared war on Britain on 18 June 1812. Although peace terms were agreed upon in the December 1814 Treaty of Ghent, the war did not officially end until the peace treaty was ratified by the United States Senate on 17 February 1815.

The Great Fire of Turku was a conflagration in the city of Turku in 1827. It is still the largest urban fire in the history of Finland and the Nordic countries. The city had faced several large fires before, including an especially devastating one in 1681.

The American Civil War was a civil war in the United States between the Union and the Confederacy, 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.

Pearl Street Station was Thomas Edison's first commercial power plant in the United States. It was located at 255–257 Pearl Street in the Financial District of Manhattan in New York City, just south of Fulton Street on a site measuring 50 by 100 feet. The station was built by the Edison Illuminating Company, under the direction of Francis Upton, hired by Thomas Edison. It had a generation capacity of 600KW DC,

George Eastman was an American innovator and entrepreneur who founded the Eastman Kodak Company and helped to bring the photographic use of roll film into the mainstream. After a decade of experiments in photography, he patented and sold a roll film camera, making amateur photography accessible to the general public for the first time. Working as the treasurer and later president of Kodak, he oversaw the expansion of the company and the film industry.

Mustafa Kemal Atatürk was a Turkish field marshal and statesperson who was the founder of the Republic of Turkey and served as its first president from 1923 until his death in 1938. He led sweeping reforms, turning Turkey into a secular, industrialising nation. Ideologically a secularist, republican and nationalist, his policies and socio-political theories became known as Kemalism. Atatürk's personality cult and the Kemalist historiography developed around it have had significant and ongoing influences on Turkey's political culture and historical narrative.

The Spanish Civil War was fought from 1936 to 1939 between the Republicans and the Nationalist rebels. Republicans loyal to the left-leaning Popular Front government of the Second Spanish Republic included socialists, anarchists, communists, and separatists, supported by the Soviet Union. The opposing Nationalists were an alliance of fascist Falangists, monarchists, conservatives, and traditionalists, supported by Nazi Germany and Fascist Italy. Initially led by a military junta, until General Francisco Franco was appointed supreme leader on 1 October 1936 of what he called the Spanish State. Due to the international political climate at the time, the war was variously viewed as class struggle, religious struggle, or struggle between republican democracy and dictatorship, revolution and counterrevolution, or between fascism and communism. The Nationalists won the war in early 1939, and ruled Spain until Franco's death in November 1975.

USS Greer (DD–145) was a Wickes-class destroyer in the United States Navy, the first ship named for Rear Admiral James A. Greer (1833–1904). In what became known as the "Greer incident," she became the first US Navy ship to fire on a German ship, three months before the United States officially entered World War II. The incident led President Franklin D. Roosevelt to issue what became known as his "shoot-on-sight" order, with the intention of creating a casus belli in the Atlantic, provoking Germany to declare war on the US.

The Continuation War, also known as the Second Soviet–Finnish War, was a conflict fought by Finland and Nazi Germany against the Soviet Union during World War II. It began with a Finnish declaration of war on 25 June 1941 and ended on 19 September 1944 with the Moscow Armistice. The Soviet Union and Finland had previously fought the Winter War from 1939 to 1940, which ended with the Soviet failure to conquer Finland and the Moscow Peace Treaty. Numerous reasons have been proposed for the Finnish decision to invade, with regaining territory lost during the Winter War regarded as the most common. Other justifications for the conflict include Finnish President Risto Ryti's vision of a Greater Finland and Commander-in-Chief Carl Gustaf Emil Mannerheim's desire to annex East Karelia.

Paul Leroy Robeson was an American bass-baritone concert artist, actor, professional football player, and activist who became famous both for his cultural accomplishments and for his political stances.

San Francisco, officially the City and County of San Francisco, is the fourth-most populous city in California and the 17th-most populous in the United States, with a population of 826,079 in 2025. Among U.S. cities with a population of 200,000 or more, San Francisco is ranked first by per capita income, third by population density, and sixth by aggregate income as of 2024. Some 4.6 million residents live in the city's metropolitan statistical area, which is the 13th-largest in the United States. Around 9.2 million live in the San Jose–San Francisco–Oakland combined statistical area, the fifth-largest in the United States.

The Forth Road Bridge is a suspension bridge that crosses the Firth of Forth in Scotland. The bridge opened in 1964 and, at the time, was the longest suspension bridge in the world outside the United States. The bridge connects Edinburgh to Fife; replacing a centuries-old ferry service to carry vehicular traffic, cyclists and pedestrians across the Forth. Railway crossings are made by the nearby Forth Bridge, opened in 1890.

Salvador Guillermo Allende Gossens was a Chilean socialist politician who served as the 29th president of Chile from 1970 until his suicide in 1973. As a socialist committed to democracy, he has been described as the first Marxist to be elected president in a liberal democracy in Latin America.

Mark Andrew Spitz is an American former competitive swimmer and nine-time Olympic champion. He was the most successful athlete at the 1972 Summer Olympics in Munich, winning seven gold medals, each in world-record time. This achievement set a record that lasted for 36 years, until it was surpassed by fellow American Michael Phelps, who won eight golds at the 2008 Summer Olympics in Beijing. Phelps, like Spitz, set seven world records.

The Sinai Interim Agreement, also known as the Sinai II Agreement, was a diplomatic agreement signed by Egypt and Israel on September 4, 1975, with the intention of peacefully resolving territorial disputes. The signing ceremony took place in Geneva.

Buckminsterfullerene is a type of fullerene with the formula C60. It has a cage-like fused-ring structure made of twenty hexagons and twelve pentagons, and resembles a football. Each of its 60 carbon atoms is bonded to its three neighbors.

The 1995 Okinawa rape incident occurred on September 4, 1995, when three U.S. servicemen, 22-year-old U.S. Navy Seaman Marcus Dion Gill, 21-year-old U.S. Marine Rodrico Harp, and 20-year-old Kendrick Ledet, all serving at Camp Hansen in Okinawa Island, rented a van and kidnapped a 12-year-old Okinawan girl. Gill beat her, after the other two duct-taped her eyes and mouth shut, and bound her hands. Gill and Harp then raped her, while Ledet—who was described in news reports at the time as being small framed in school—claimed he only pretended to do so due to fear of Gill.

Tokyo DisneySea is a theme park at the Tokyo Disney Resort located in Urayasu, Chiba Prefecture, Japan, just next to Tokyo. It opened on 4 September 2001, at a cost of 335 billion yen. The Oriental Land Company owns the park and licenses intellectual property from the Walt Disney Company. In 2024, Tokyo DisneySea hosted 12.4 million visitors, making it the seventh-most visited theme park in the world and the third-most visited in Japan.

al-Qaeda is a pan-Islamist militant organization led by Sunni Islamist jihadists who self-identify as a vanguard spearheading a global Islamist revolution to unite the Muslim world under a supra-national Islamic caliphate. Its membership is primarily composed of Arabs, with additional representation from other ethnic groups. Al-Qaeda has mounted attacks on civilian and military targets of the U.S. and its allies; such as the 1998 U.S. embassy bombings, the USS Cole bombing, and the September 11 attacks. It has been designated a terrorist organization by the United Nations and over two dozen countries around the world.

On September 4, 2022, Myles Sanderson killed 11 and injured 17 people in a mass stabbing at 13 locations on the James Smith Cree Nation and in Weldon, Saskatchewan, Canada. Some of the victims are believed to have been targeted, while others were randomly attacked. It is one of the deadliest massacres in Canadian history.