1054
ID: 3739
Battle of Mortemer - William defeats French invasion, King Henry I's brother captured
ID: 3739
1054
ID: 4775
Great Schism - Papal legate and Patriarch excommunicate each other, permanent Christian division
ID: 4775
1054
ID: 5183
Henry I defeated by William of Normandy at Mortemer - French royal power at nadir, confined to Île-de-France
ID: 5183
1054
ID: 5047
July 16, 1054
Great Schism - Cardinal Humbert excommunicates Cerularius, who excommunicates papal legates, East-West split formalized
ID: 5047