April 15 events in history

769 The Lateran Council condemned the Council of Hieria and anathematized its iconoclastic rulings
1071 Bari, the last Byzantine possession in southern Italy, is surrendered to Robert Guiscard
1395 Tokhtamysh–Timur war: Battle of the Terek River: Timur defeats Tokhtamysh of the Golden Horde at the Volga. The Golden Horde capital city, Sarai, is razed to the ground and Timur installs a puppet ruler on the Golden Horde throne. Tokhtamysh escapes to Lithuania
1450 Battle of Formigny: Toward the end of the Hundred Years' War, the French attack and nearly annihilate English forces, ending English domination in Northern France
1632 Battle of Rain: Swedes under Gustavus Adolphus defeat the Holy Roman Empire during the Thirty Years' War
1638 Tokugawa shogunate forces put down the Shimabara Rebellion when they retake Hara Castle from the rebels
1642 Irish Confederate Wars: A Confederate Irish militia is routed in the Battle of Kilrush when it attempts to halt the progress of a Parliamentarian army
1715 The Pocotaligo Massacre triggers the start of the Yamasee War in colonial South Carolina
1738 Serse, an Italian opera by George Frideric Handel receives its premiere performance in London, England
1755 Samuel Johnson's A Dictionary of the English Language is published in London
1783 Preliminary articles of peace ending the American Revolutionary War (or American War of Independence) are ratified
1802 William Wordsworth and his sister, Dorothy see a "long belt" of daffodils, inspiring the former to pen I Wandered Lonely as a Cloud
1817 Thomas Hopkins Gallaudet and Laurent Clerc founded the American School for the Deaf, the first American school for deaf students, in Hartford, Connecticut
1861 President Abraham Lincoln calls for 75,000 Volunteers to quell the insurrection that soon became the American Civil War
1865 Abraham Lincoln dies after being shot the previous evening by actor John Wilkes Booth
1892 The General Electric Company is formed. RMS Titanic disaster
1896 Closing ceremony of the Games of the I Olympiad in Athens, Greece
1900 Philippine–American War: Filipino guerrillas launch a surprise attack on U.S. infantry and begin a four-day siege of Catubig, Philippines
1907 Triangle Fraternity was founded at the University of Illinois at Urbana–Champaign
1912 The British passenger liner RMS Titanic sinks in the North Atlantic at 2:20 a.m., two hours and forty minutes after hitting an iceberg. Only 710 of 2,227 passengers and crew on board survive
1920 Two security guards are murdered during a robbery in South Braintree, Massachusetts. Anarchists Sacco and Vanzetti would be convicted of and executed for the crime, amid much controversy
1921 Black Friday: mine owners announce more wage and price cuts, leading to the threat of a strike all across England
1922 U.S. Senator John B. Kendrick of Wyoming introduces a resolution calling for an investigation of secret land deal, which leads to the discovery of the Teapot Dome scandal
1923 Insulin becomes generally available for use by people with diabetes
1924 Rand McNally publishes its first road atlas
1927 The Great Mississippi Flood of 1927, the most destructive river flood in U.S. history, begins
1935 Roerich Pact signed in Washington, D.C
1936 First day of the Arab revolt in Mandatory Palestine
1936 Aer Lingus (Aer Loingeas) is founded by the Irish government as the national airline of the Republic of Ireland
1940 The Allies begin their attack on the Norwegian town of Narvik which is occupied by Nazi Germany
1941 In the Belfast Blitz, two-hundred bombers of the German Luftwaffe attack Belfast, Northern Ireland, United Kingdom killing one thousand people
1942 The George Cross is awarded "to the island fortress of Malta – its people and defenders" by King George VI
1945 The Bergen-Belsen concentration camp is liberated
1947 Jackie Robinson debuts for the Brooklyn Dodgers, breaking baseball's color line
1952 The maiden flight of the B-52 Stratofortress
1955 McDonald's restaurant dates its founding to the opening of a franchised restaurant by Ray Kroc, in Des Plaines, Illinois
1957 White Rock, British Columbia officially separates from Surrey, British Columbia and is incorporated as a new city
1960 At Shaw University in Raleigh, North Carolina, Ella Baker leads a conference that results in the creation of the Student Nonviolent Coordinating Committee, one of the principal organizations of the African-American Civil Rights Movement in the 1960s
1964 The first Ford Mustang rolls off the show room floor, two days before it is set to go on sale nationwide
1969 The EC-121 shootdown incident: North Korea shoots down a United States Navy aircraft over the Sea of Japan, killing all 31 on board
1970 During the Cambodian Civil War, massacres of the Vietnamese minority results in 800 bodies flowing down the Mekong River into South Vietnam
1984 The inaugural World Youth Day is held in St. Peter's Square, Vatican City
1986 The United States launches Operation El Dorado Canyon, its bombing raids against Libyan targets in response to a bombing in West Germany that killed two U.S. servicemen
1989 Hillsborough disaster: A human crush occurs at Hillsborough Stadium, home of Sheffield Wednesday, in the FA Cup Semi-final, resulting in the deaths of 96 Liverpool fans
1989 Upon Hu Yaobang's death, the Tiananmen Square protests of 1989 begin in China
2013 Two bombs explode near the finish line at the Boston Marathon in Boston, Massachusetts, killing three people and injuring 264 others
2014 More than 200 female students are declared missing after a mass kidnapping in Borno State, Nigeria
2014 A total lunar eclipse occurs, producing a Blood Moon