The day that Rome was founded by Romulus and Remus. April 21 is the 111th day of the year in the Gregorian calendar (112th in leap years). There are 254 days remaining.

  1. 753 BC - Romulus and Remus found Rome (traditional).
  2. 1509 - Henry VIII ascends the throne of England (unofficially) at the death of his father, Henry VII
  3. 1836 - Texas Revolution: Battle of San Jacinto – Republic of Texas forces under Sam Houston defeat troops under Mexican General Antonio López de Santa Anna.
  4. 1918 - World War I: German fighter ace Manfred von Richthofen, known as "The Red Baron", is shot down and killed over Vaux sur Somme in France.
  5. 1930 - A fire at a Columbus, Ohio, USA, penitentiary kills 320 people.
  6. 1944 - Women in France receive the right to vote.
  7. 1952 - Secretary's Day (now Administrative Professionals' Day) is first celebrated.
  8. 1956 - Elvis Presley's song "Heartbreak Hotel" becomes the "King's" first song to reach the top of the Cash Box magazine [1] music charts.
  9. 1962 - The Seattle World's Fair (Century 21 Exposition) opens. It is the first World's Fair in the U.S. since World War II. [2]
  10. 1965 - The 1964-1965 New York World's Fair opens for its second and final season.
  11. 1989 - Tiananmen Square Protests of 1989: In Beijing, around 100,000 students gather in Tiananmen Square to commemorate the late Chinese reform leader Hu Yaobang.
  12. 1994 - The first discoveries of extrasolar planets are announced by astronomer Alexander Wolszczan.
  13. 2005 - John Negroponte becomes the first United States Director of National Intelligence.