- Introduction of Christianity in Sweden .
- 1053 : Leo IX. is captured by the Normans in southern Italy.
- Schism between the Byzantine and Latin churches.
- April 19, 1054 : Pope Leo IX. dies.
- June 24, 1054: Bull of excommunication from Byzantium to the Pope.
- July 16, 1054: The Pope's counter-ban on the Byzantine Patriarch .
- 1056 : Henry III. dies.