May 12 is the 132nd day of the year in the Gregorian Calendar (133rd in leap years). There are 233 days remaining.

  1. 1191 - Richard I of England marries Berengaria of Navarre.
  2. 1264 - The Battle of Lewes, between King Henry III of England and the rebel Simon de Montfort, 6th Earl of Leicester, begins.
  3. 1328 - Antipope Nicholas V, a claimant to the papacy, is consecrated in Rome by the Bishop of Venice.
  4. 1364 - Jagiellonian University, the oldest university in Poland, was founded in Kraków, Poland.
  5. 1551 - National University of San Marcos, the oldest university in the Americas, was founded in Lima, Peru.
  6. 1588 - French Wars of Religion: Henry III of France flees Paris after Henry of Guise enters the city.
  7. 1689 - King William's War: William III of England joins the League of Augsburg starting a war with France.
  8. 1780 - American Revolutionary War: Charleston, South Carolina is taken by British forces.
  9. 1797 - First Coalition: Napoleon I of France conquers Venice.
  10. 1862 - U.S. federal troops occupy Baton Rouge, Louisiana.
  11. 1863 - American Civil War: Battle of Raymond: two divisions of James B. McPherson's XVII Corps (ACW) turn the left wing of Confederate General John C. Pemberton's defensive line on Fourteen Mile Creek, opening up the interior of Mississippi to the Union Army during the Vicksburg Campaign.
  12. 1864 - American Civil War: Battle of Spotsylvania Court House: Thousands of Union and Confederate soldiers die in "the Bloody Angle".
  13. 1865 - American Civil War: Battle of Palmito Ranch: The first day of the last major land action to take place during the Civil War, resulting in a Conferderate victory.
  14. 1870 - The Manitoba Act was given the Royal Assent, paving the way for Manitoba to become a province of Canada on July 15.
  15. 1873 - Oscar II of Sweden-Norway is crowned King of Sweden.
  16. 1881 - In North Africa, Tunisia becomes a French protectorate.
  17. 1885 - North-West Rebellion: The four-day Battle of Batoche, pitting rebel Métis against the Canadian government, comes to an end with a decisive rebel defeat.
  18. 1890 - The first-ever official County Championship match begins. Yorkshire beat Gloucestershire by eight wickets at Bristol. George Ulyett scores the first century in the competition.
  19. 1926 - UK General Strike 1926: In the United Kingdom, a nine-day general strike by trade unions ends.
  20. 1932 - Ten weeks after his abduction, the infant son of Charles Lindbergh is found dead in Hopewell, New Jersey just a few miles from the Lindberghs' home.
  21. 1937 - Coronation of King George VI of Britain at Westminster Abbey.
  22. 1941 - Konrad Zuse presented the Z3, the world's first working programmable, fully automatic computer in Berlin.
  23. 1942 - World War II: Second Battle of Kharkov – In the eastern Ukraine, the Soviet Army initiates a major offensive. During the battle the Soviets will capture the city of Kharkov from the German Army, only to be encircled and destroyed.
  24. 1942 - 1,500 Jews are sent to gas chambers in Auschwitz.
  25. 1949 - Cold War: The Soviet Union lifts its Blockade of Berlin.
  26. 1952 - Gaj Singh crowned Maharaja of Jodhpur.
  27. 1958 - A formal North American Aerospace Defense Command agreement is signed between the United States and Canada.
  28. 1962 - Douglas MacArthur delivers his famous "Duty, Honor, Country" valedictory speech at West Point.
  29. 1965 - The Soviet spacecraft Luna 5 crashes on the Moon.
  30. 1966 - Busch Memorial Stadium, home of the St. Louis Cardinals major league baseball team, opens in St. Louis, Missouri.
  31. 1967 - At Queen Elizabeth Hall, England, Pink Floyd stages the first-ever quadraphonic rock concert.
  32. 1970 - Ernie Banks becomes the ninth member of the 500 home run club with a home run at Wrigley Field in Chicago.
  33. 1975 - Mayagüez incident: The Cambodian navy seizes the American merchant ship SS Mayaguez in international waters.
  34. 1978 - In Zaïre, rebels occupy the city of Kolwezi, the mining center of the province of Shaba. The government of Zaïre asks the U.S., France and Belgium to restore order.
  35. 1982 - During a procession outside the shrine of the Virgin Mary in Fátima, Portugal, security guards overpower Juan Fernandez Krohn before he can attack Pope John Paul II with a bayonet. Krohn, an ultraconservative Spanish priest opposed to the Vatican II reforms, decided that the Pope must be killed for being an "agent of Moscow."
  36. 1989 - A Southern Pacific Railroad freight train derails on the very steep Cajon Pass in San Bernardino, California, killing four people.
  37. 1997 - In the 7th inning of a baseball game between the Anaheim Angels and the Chicago White Sox, the Angels score 13 runs.
  38. 1999 - David Steel becomes the first Presiding Officer (speaker) of the modern Scottish Parliament.
  39. 2000 - The Tate Modern art gallery opens in London.
  40. 2002 - Former President Jimmy Carter arrives in Cuba for a five-day visit with Fidel Castro becoming first President of the United States, in or out of office, to visit the island since Castro's 1959 revolution.
  41. 2003 - The Riyadh compound bombings, carried out by Al Qaeda, kill 26.
  42. 2005 - Kaspars Petrovs is convicted of the strangulation murder and robberies of thirteen elderly women in Riga, Latvia.
  43. 2006 - Justin Gatlin ties the fastest 100m sprint ever in a time of 9.77 seconds in Doha, Qatar.