* 1081 – Alexios I Komnenos is crowned Byzantine emperor at Constantinople, bringing the Komnenian dynasty to full power.
* 1147 – First historical record of Moscow.
* 1581 – Francis Drake is knighted for completing a circumnavigation of the world.
* 1660 – Declaration of Breda by King Charles II of England.
* 1721 – Sir Robert Walpole enters office as the first Prime Minister of the United Kingdom under King George I.
* 1812 – U.S. President James Madison enacted a ninety-day embargo on trade with the United Kingdom.
* 1814 – Napoleon abdicates for the first time.
* 1818 – The United States Congress adopts the flag of the United States with 13 red and white stripes and one star for each state (then 20).
* 1841 – William Henry Harrison dies of pneumonia becoming the first President of the United States to die in office and the one with the shortest term served.
* 1850 – The Great Fire of Cottenham, a large part of the Cambridgeshire village (England) is burnt to the ground under suspicious circumstances.
* 1850 – Los Angeles, California is incorporated as a city.
* 1859 – Bryant's Minstrels debut "Dixie" in New York City in the finale of a blackface minstrel show.
* 1865 – American Civil War: A day after Union forces capture Richmond, Virginia, U.S. President Abraham Lincoln visits the Confederate capital.
* 1866 – Alexander II of Russia narrowly escapes an assassination attempt in the city of Kiev.
* 1873 – The Kennel Club is founded, the oldest and first official registry of purebred dogs in the world.
* 1887 – Argonia, Kansas elects Susanna M. Salter as the first female mayor in the United States.
* 1905 – In India, the 1905 Kangra earthquake hits the Kangra valley, kills 20,000, and destroys most buildings in Kangra, Mcleodganj and Dharamshala
* 1913 – The Greek aviator Emmanouil Argyropoulos becomes the first pilot victim of the Hellenic Air Force when his plane crashes.
* 1930 – The Communist Party of Panama is founded.
* 1933 – USS Akron (ZRS-4) wrecked off the New Jersey coast due to severe weather.
* 1939 – Faisal II becomes King of Iraq.
* 1944 – World War II: First bombardment of Bucharest by Anglo-American forces kills 3000 civilians.
* 1945 – World War II: American troops liberate Ohrdruf forced labor camp in Germany.
* 1945 – World War II: Soviet Army takes control of Hungary.
* 1945 – World War II: American troops capture Kassel.
* 1949 – Twelve nations sign the North Atlantic Treaty creating the North Atlantic Treaty Organization.
* 1958 – The CND Peace Symbol displayed in public for the first time in London.
* 1960 – France agrees to grant independence to the Mali Federation, a union of Senegal and French Sudan.
* 1964 – The Beatles occupy the top five positions on the Billboard Hot 100 pop chart.
* 1965 – The first model of the new Saab Viggen fighter aircraft plane is unveiled.
* 1967 – Martin Luther King, Jr. delivers his "Beyond Vietnam: A Time to Break Silence" speech in New York City's Riverside Church.
* 1968 – Martin Luther King, Jr. is assassinated by James Earl Ray at a motel in Memphis, Tennessee.
* 1968 – Apollo program: NASA launches Apollo 6.
* 1968 – AEK Athens BC becomes the first Greek team to win the European Basketball Cup.
* 1969 – Dr. Denton Cooley implants the first temporary artificial heart.
* 1973 – The World Trade Center in New York is officially dedicated.
* 1975 – Microsoft is founded as a partnership between Bill Gates and Paul Allen in Albuquerque, New Mexico
* 1975 – Vietnam War: Operation Baby Lift – A United States Air Force C-5A Galaxy crashes near Saigon, South Vietnam shortly after takeoff, transporting orphans – 172 die.
* 1976 – Prince Norodom Sihanouk resigns as leader of Cambodia and is placed under house arrest.
* 1979 – President Zulfikar Ali Bhutto of Pakistan is executed.
* 1979 – The 2nd Congress of the Communist Youth of Greece starts.
* 1983 – Space Shuttle Challenger makes its maiden voyage into space (STS-6).
* 1984 – President Ronald Reagan calls for an international ban on chemical weapons.
* 1988 – Governor Evan Mecham of Arizona is convicted in his impeachment trial and removed from office.
* 1991 – Senator John Heinz of Pennsylvania and six others are killed when a helicopter collides with their plane over an elementary school in Merion, Pennsylvania.
* 1994 – Marc Andreessen and Jim Clark found Netscape Communications Corporation under the name "Mosaic Communications Corporation".
* 1996 – Comet Hyakutake is imaged by the USA Asteroid Orbiter Near Earth Asteroid Rendezvous.
* 2002 – The Angolan government and UNITA rebels sign a peace treaty ending the Angolan Civil War.
* 2002 – In what is known as the Society Murders, Matthew Wales kills his parents in Melbourne, Australia.
* 2007 – 15 British Royal Navy personnel held in Iran are released by the Iranian President.