Events

• July 4 - A supernova is recorded by the Chinese and possibly Native Americans near the star ζ Tauri. For several months it remains bright enough to be seen during the day. Its remnants form the Crab Nebula.
• Pope Leo IX and Michael Cerularius, Patriarch of Constantinople, decree each other's excommunication, finalising the Great Schism between the Roman Catholic and Orthodox Christian Churches. To this day each claims to be the One Holy Catholic and Apostolic Church and each denies the other's right to that name.
• Malcolm Canmore begins his campaign for the throne of Scotland. July 27 Macbeth's troops defeated in Dunsinane Hill but he himself escapes

Births

Deaths

• April 19 - Pope Leo IX
• September 24 - Hermannus Contractus

Heads of states

• Holy See - Leo IX pope (1049-1054)

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