1054

Years: 1051 1052 1053 - 1054 - 1055 1056 1057
Decades: 1020s 1030s 1040s - 1050s - 1060s 1070s 1080s
Centuries: 10th century - 11th century - 12th century

Battle of Mortemer, February: Normans defeated a French army as it was caught pillaging and plundering. King Henry I of France withdrew his main army from Normandy as a result.
Cardinal Humbertus, a representative of Pope Leo IX, and Michael Cerularius, Patriarch of Constantinople, decree each other's excommunication. Some historians look to this act as initiating 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. However, at the time of the excommunication, the Pope was dead; therefore, Cardinal Humbertus' act had no legal force. Moreover, individuals were excommunicated, not entire Churches.
Malcolm Canmore begins his campaign for the throne of Scotland.
July 4 - The SN 1054 supernova is recorded by the Chinese, Arab and possibly Native Americans near the star ζ Tauri. For 23 days it remained bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952). -- Reference, Journal of Astronomy, part 9, chapter 56 of Sung History (Sung Shih) first printing, 1340. facsimile on the frontispiece of Misner, Thorne, Wheeler Gravitation, 1973.
July 27 - King Macbeth of Scotland's troops defeated in Dunsinane Hill. Macbeth himself escapes.

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