- 240 – Shapur I becomes co-emperor of the Sasanian Empire with his father Ardashir I.[1]
- 467 – Anthemius is elevated to Emperor of the Western Roman Empire.[2]
- 627 – King Edwin of Northumbria is converted to Christianity by Paulinus, bishop of York.[3]
- 1012 – Duke Oldřich of Bohemia deposes and blinds his brother Jaromír, who flees to Poland.
- 1204 – The Crusaders of the Fourth Crusade breach the walls of Constantinople and enter the city, which they completely occupy the following day.
- 1606 – The Union Flag is adopted as the flag of English and Scottish ships.
- 1776 – American Revolution: With the Halifax Resolves, the North Carolina Provincial Congress authorizes its Congressional delegation to vote for independence from Britain.
- 1807 – The Froberg mutiny ends when the remaining mutineers blow up the magazine of Fort Ricasoli.
- 1820 – Alexander Ypsilantis is declared leader of Filiki Eteria, a secret organization to overthrow Ottoman rule over Greece.
- 1831 – Soldiers marching on the Broughton Suspension Bridge in Manchester, England, cause it to collapse.
- 1861 – American Civil War: Battle of Fort Sumter. The war begins with Confederate forces firing on Fort Sumter, in the harbor of Charleston, South Carolina.
- 1862 – American Civil War: The Andrews Raid (the Great Locomotive Chase) occurs, starting from Big Shanty, Georgia (now Kennesaw).
- 1864 – American Civil War: The Battle of Fort Pillow: Confederate forces kill most of the African American soldiers that surrendered at Fort Pillow, Tennessee.
- 1865 – American Civil War: Mobile, Alabama, falls to the Union Army.
- 1877 – The United Kingdom annexes the Transvaal.[4]
- 1910 – SMS Zrínyi, one of the last pre-dreadnought battleships built by the Austro-Hungarian Navy, is launched.
- 1917 – World War I: Canadian forces successfully complete the taking of Vimy Ridge from the Germans.
- 1927 – Shanghai massacre of 1927: Chiang Kai-shek orders the Chinese Communist Party members executed in Shanghai, ending the First United Front.
- 1927 – Rocksprings, Texas is hit by an F5 tornado that destroys 235 of the 247 buildings in the town, kills 72 townspeople and injures 205; third deadliest tornado in Texas history.
- 1928 – The Bremen, a German Junkers W 33 type aircraft, takes off for the first successful transatlantic aeroplane flight from east to west.
- 1934 – The strongest surface wind gust in the world at the time of 231 mph, is measured on the summit of Mount Washington, New Hampshire. It has since been surpassed.
- 1934 – The U.S. Auto-Lite strike begins, culminating in a five-day melee between Ohio National Guard troops and 6,000 strikers and picketers.
- 1937 – Sir Frank Whittle ground-tests the first jet engine designed to power an aircraft, at Rugby, England.
- 1945 – U.S. President Franklin D. Roosevelt dies in office; Vice President Harry S. Truman becomes President upon Roosevelt’s death.
- 1945 – World War II: The U.S. Ninth Army under General William H. Simpson crosses the Elbe River astride Magdeburg, and reaches Tangermünde—only 50 miles from Berlin.
- 1955 – The polio vaccine, developed by Dr. Jonas Salk, is declared safe and effective.
- 1961 – Cold War: Space Race: The Soviet cosmonaut Yuri Gagarin becomes the first human to travel into outer space and perform the first crewed orbital flight, Vostok 1.
- 1963 – The Soviet nuclear-powered submarine K-33 collides with the Finnish merchant vessel M/S Finnclipper in the Danish straits.
- 1970 – Soviet submarine K-8, carrying four nuclear torpedoes, sinks in the Bay of Biscay four days after a fire on board.
- 1980 – The Americo-Liberian government of Liberia is violently deposed.
- 1980 – Transbrasil Flight 303, a Boeing 727, crashes on approach to Hercílio Luz International Airport, in Florianópolis, Brazil. Fifty-five out of the 58 people on board are killed.[5]
- 1981 – The first launch of a Space Shuttle (Columbia) takes place: The STS-1 mission.
- 1983 – Harold Washington is elected as the first black mayor of Chicago.[6]
- 1990 – Jim Gary‘s “Twentieth Century Dinosaurs” exhibition opens at the Smithsonian Institution National Museum of Natural History in Washington, D.C. He is the only sculptor ever invited to present a solo exhibition there.
- 1992 – The Euro Disney Resort officially opens with its theme park Euro Disneyland; the resort and its park’s name are subsequently changed to Disneyland Paris.
- 1999 – United States President Bill Clinton is cited for contempt of court for giving “intentionally false statements” in a civil lawsuit; he is later fined and disbarred.
- 2002 – A suicide bomber blows herself up at the entrance to Jerusalem’s Mahane Yehuda Market, killing seven people and wounding 104.
- 2007 – A suicide bomber penetrates the Green Zone and detonates in a cafeteria within a parliament building, killing Iraqi MP Mohammed Awad and wounding more than twenty other people.
- 2009 – Zimbabwe officially abandons the Zimbabwean dollar as its official currency.
- 2010 – Merano derailment: A rail accident in South Tyrol kills nine people and injures a further 28.[7]
- 2013 – Two suicide bombers kill three Chadian soldiers and injure dozens of civilians at a market in Kidal, Mali.
- 2014 – The Great Fire of Valparaíso ravages the Chilean city of Valparaíso, killing 16 people, displacing nearly 10,000, and destroying over 2,000 homes.[8]
-Source: wikipedia
