Important Historical Events Today, What Happened Today in History?

Today's Historical Events. What Happened This Day In History? Here is a chronological timetable of historical events that occurred on this day in history. Historical facts of the day in the areas of military, politics, science, music, sports, arts, entertainment and more. Discover what happened 21 April in history.

Historical Events on April 21

Date Event
753 Romulus founds Rome (traditional date).
43 Battle of Mutina: Mark Antony is again defeated in battle by Aulus Hirtius, who is killed. Antony fails to capture Mutina and Decimus Brutus is murdered shortly after.
900 The Laguna Copperplate Inscription (the earliest known written document found in what is now the Philippines): the Commander-in-Chief of the Kingdom of Tondo, as represented by the Honourable Jayadewa, Lord Minister of Pailah, pardons from all debt the Honourable Namwaran and his relations.
1092 The Diocese of Pisa is elevated to the rank of metropolitan archdiocese by Pope Urban II
1506 The three-day Lisbon Massacre comes to an end with the slaughter of over 1,900 suspected Jews by Portuguese Catholics.
1509 Henry VIII ascends the throne of England on the death of his father, Henry VII.
1526 The last ruler of the Lodi dynasty, Ibrahim Lodi is defeated and killed by Babur in the First Battle of Panipat.
1615 The Wignacourt Aqueduct is inaugurated in Malta.
1782 The city of Rattanakosin, now known internationally as Bangkok, is founded on the eastern bank of the Chao Phraya River by King Buddha Yodfa Chulaloke.
1789 John Adams sworn in as 1st US Vice President (nine days before George Washington)
1789 George Washington's reception at Trenton is hosted by the Ladies of Trenton as he journeys to New York City for his first inauguration.
1792 Tiradentes, a revolutionary leading a movement for Brazil's independence, is hanged, drawn and quartered.
1802 Twelve thousand Wahhabis sack Karbala, killing over three thousand inhabitants.
1806 Action of 21 April 1806: A French frigate escapes British forces off the coast of South Africa.
1809 Two Austrian army corps are driven from Landshut by a First French Empire army led by Napoleon as two French corps to the north hold off the main Austrian army on the first day of the Battle of Eckmühl.
1821 Benderli Ali Pasha arrives in Constantinople as the new Grand Vizier of the Ottoman Empire; he remains in power for only nine days before being sent into exile.
1836 Texas Revolution: The Battle of San Jacinto: Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.
1856 Australian labour movement: Stonemasons and building workers on building sites around Melbourne march from the University of Melbourne to Parliament House to achieve an eight-hour day.
1894 Norway formally adopts the Krag–Jørgensen bolt-action rifle as the main arm of its armed forces, a weapon that would remain in service for almost 50 years.
1898 Spanish–American War: The United States Navy begins a blockade of Cuban ports. When the U.S. Congress issued a declaration of war on April 25, it declared that a state of war had existed from this date.
1914 Ypiranga incident: A German arms shipment to Mexico is intercepted by the U.S. Navy near Veracruz.
1918 World War I: German fighter ace Manfred von Richthofen, better known as "The Red Baron", is shot down and killed over Vaux-sur-Somme in France.
1926 Al-Baqi cemetery, former site of the mausoleum of four Shi'a Imams, is leveled to the ground by Wahhabis.
1934 The "Surgeon's Photograph", the most famous photo allegedly showing the Loch Ness Monster, is published in the Daily Mail (in 1994, it is revealed to be a hoax).
1945 World War II: Soviet forces south of Berlin at Zossen attack the German High Command headquarters.
1948 United Nations Security Council Resolution 47 relating to Kashmir conflict is adopted.
1952 Secretary's Day (now Administrative Professionals' Day) is first celebrated.
1958 United Airlines Flight 736 collides with a United States Air Force fighter jet near Arden, Nevada in what is now Enterprise, Nevada.
1960 Brasília, Brazil's capital, is officially inaugurated. At 09:30, the Three Powers of the Republic are simultaneously transferred from the old capital, Rio de Janeiro.
1962 The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the United States since World War II.
1963 The first election of the Universal House of Justice is held, marking its establishment as the supreme governing institution of the Baháʼí Faith.
1964 A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.
1965 The 1964–1965 New York World's Fair opens for its second and final season.
1966 Rastafari movement: Haile Selassie of Ethiopia visits Jamaica, an event now celebrated as Grounation Day.
1967 A few days before the general election in Greece, Colonel George Papadopoulos leads a coup d'état, establishing a military regime that lasts for seven years.
1972 Astronauts John Young and Charles Duke fly Apollo 16's Apollo Lunar Module to the Moon's surface, the fifth NASA Apollo Program crewed lunar landing.
1975 Vietnam War: President of South Vietnam Nguyễn Văn Thiệu flees Saigon, as Xuân Lộc, the last South Vietnamese outpost blocking a direct North Vietnamese assault on Saigon, falls.
1977 Annie opens on Broadway.
1982 Baseball: Rollie Fingers of the Milwaukee Brewers becomes the first pitcher to record 300 saves.
1985 The compound of the militant group The Covenant, The Sword, and the Arm of the Lord surrenders to federal authorities in Arkansas after a two-day government siege.
1987 The Tamil Tigers are blamed for a car bomb that detonates in the Sri Lankan capital city of Colombo, killing 106 people.
1989 Tiananmen Square protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate Chinese reform leader Hu Yaobang.
1993 The Supreme Court in La Paz, Bolivia, sentences former dictator Luis García Meza to 30 years in jail without parole for murder, theft, fraud and violating the constitution.
2004 Five suicide car bombers target police stations in and around Basra, killing 74 people and wounding 160.
2010 The controversial Kharkiv Pact (Russian Ukrainian Naval Base for Gas Treaty) is signed in Kharkiv, Ukraine, by Ukrainian President Viktor Yanukovych and Russian President Dmitry Medvedev; it was unilaterally terminated by Russia on March 31, 2014.
2012 Two trains are involved in a head-on collision near Sloterdijk, Amsterdam, in the Netherlands, injuring 116 people.
2014 The American city of Flint, Michigan switches its water source to the Flint River, beginning the ongoing Flint water crisis which has caused lead poisoning in up to 12,000 people, and 15 deaths from Legionnaires disease, ultimately leading to criminal indictments against 15 people, five of whom have been charged with involuntary manslaughter.
2019 Eight bombs explode at churches, hotels, and other locations in Sri Lanka on Easter Sunday; more than 250 people are killed.
2021 Indonesian Navy submarine KRI Nanggala (402) sinks in the Bali Sea during a military drill, killing all 53 on board.