Magna Carta
May 12 English barons serve ultimatum on King John which eventually leads to the creation and signing of the Magna Carta
Battle of Interest
Jun 1 Peking [Beijing], then a city of over one million, under control of Jurchen ruler Emperor Xuanzong of Jin, is captured and looted for a month by the Mongols under Genghis Khan
- Jun 15 King John signs Magna Carta at Runnymede, near Windsor, England
- Jul 23 Frederick II crowned King of the Romans (King of the Germans) in Aachen
- Aug 24 Pope Innocent III declares the Magna Carta invalid
- Nov 11 4th Lateran Council (12th ecumenical council) opens in Rome
- Nov 30 Pope Innocent III closes 4th council of Lateranen