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- Introduction of Christianity in Sweden.
- 1053: Leo IX. is captured by the Normans in southern Italy.
- Schism between the Byzantine and the Latin Church.
- April 19, 1054: Pope Leo IX. die.
- June 24, 1054: Bull of excommunication from Byzantium to the Pope.
- July 16, 1054: Against the spell of the Pope to the Byzantine patriarch.
- 1056: Henry III. die.