| May 12 | English barons serve ultimatum on king John without Country |
| June 15 | King John signs Magna Carta at Runnymede, England |
| July 23 | Frederik II crowns himself Roman Catholic king |
| July 25 | Frederik II (20) crowned king of German |
| August 24 | Pope Innocent III declares Magna Carta invalid |
| November 11 | 4th Lateran Council (12th ecumenical council) opens in Rome |
| November 30 | Pope Innocent III closes 4th council of Lateranen |