11th » Prime Minister of the United Kingdom named Prime Minister Spencer Perceval is assassinated by John Bellingham in the lobby of the British House of Commons known as House of Commons, London.
16th » Russian Field Marshal Mikhail Kutuzov signs the Treaty of Bucharest (1812) called Treaty of Bucharest, ending the Russo-Turkish War (1806–12) or Russo-Turkish War. Bessarabia is annexed by Imperial Russia.
18th » John Bellingham is found guilty and sentenced to death by hanging for the assassination of British Prime Minister Spencer Perceval.
22nd » Action of 22 May 1812: A small French two-frigate squadron comprising French frigate Ariane (1811) 'Ariane' and French frigate Andromaque (1811) 'Andromaque', returning from a commerce raiding campaign in the Atlantic, meets the 74-gun HMS Northumberland