May 12

• May 12, 1191
  Richard I of England marries Berengaria of Navarre in Limassol, Cyprus
• May 12, 1215
  English barons serve ultimatum on king John
• May 12, 1264
  Simon de Montfort, 6th Earl of Leicester, beats and captures English king Henry III at the Battle at Lewes during the Baron's War
• May 12, 1328
  Louis IV, Holy Roman Emperor selects Pietro Rainalducci as antipope Nicolaas V
• May 12, 1588
  King Henry III of France flees Paris after Catholic League under duke Henry of Guise enter the city
• May 12, 1689
  England's King William III joins the League of Augsburg and the Netherlands to counter the war of aggression launched by Louis XIV against the Palatinate states in Germany
• May 12, 1777
  First ice cream advertisement appears in New York
• May 12, 1780
  Charleston, South Carolina falls to the British after a long fight and siege
• May 12, 1789
  In England William Wilberforce lays out his case for the abolition of slavery to the House of Commons
• May 12, 1809
  Napoleon's troops capture Vienna, Austria
• May 12, 1881
  Treaty of Bardo, signed between representatives of the French Republic and Tunisian bey Muhammed as-Sadiq, establishes Tunis as a French protectorate and gives France responsibility for the defense and foreign policy decisions of Tunisia
• May 12, 1885
  In the Battle of Batoche, Saskatchewan, Metis rebels ran out of ammunition and resort to firing pebbles from their guns, until they are forced to retreat
• May 12, 1940
  Germany forces move to Meuse River and launch a blitz conquest of France
• May 12, 1951
  First hydrogen bomb test on a very small scale occurs during Operation Greenhouse on Enewetak Atoll