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Centuries: 10th century - 11th century - 12th century
- 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 Catholic and Orthodox 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.