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|1054 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1807|
|Balinese saka calendar||975–976|
|English Regnal year||N/A|
|Chinese calendar||癸巳年 (Water Snake)|
3750 or 3690
— to —
甲午年 (Wood Horse)
3751 or 3691
|- Vikram Samvat||1110–1111|
|- Shaka Samvat||975–976|
|- Kali Yuga||4154–4155|
|Japanese calendar||Tengi 2|
|Minguo calendar||858 before ROC|
|Seleucid era||1365/1366 AG|
|Thai solar calendar||1596–1597|
1180 or 799 or 27
— to —
1181 or 800 or 28
|Wikimedia Commons has media related to 1054.|
- February – Battle of Mortemer: The Normans defeat a French army, as it is caught pillaging and plundering. King Henry I of France withdraws his main army from Normandy as a result.
- April 30 – The earliest known European tornado strikes Rosdalla, Kilbeggan (Ireland).
- July 4 – The SN 1054 supernova is recorded by the Chinese, Arabs and possibly Native Americans, near the star Zeta Tauri. For 23 days it remains bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952).
- July 16 – Cardinal Humbertus, a representative of the newly deceased Pope Leo IX, and Michael Cerularius, Patriarch of Constantinople, decree each other excommunicated. Most historians look to this act as the final step in the initiation of the Great Schism between the Roman Catholic and Orthodox Christian Churches (In 1965, those excommunications will be rescinded by Pope Paul VI and Patriarch Athenagoras, when they meet in the Second Vatican Council. However, to this day each church claims to be the One Holy Catholic and Apostolic Church, and each denies the other's right to that name) (See East–West Schism).
- July 27 – Siward, Earl of Northumbria invades Scotland, to support Malcolm Canmore against Macbeth, who usurped the Scottish throne from Malcolm's father, King Duncan. Macbeth is defeated at Dunsinane.
- Lý Nhật Tôn, third king of the Lý dynasty, begins to rule in Vietnam, and changes the country's official name to Đại Việt.
- Al-Hariri of Basra (d. 1122), Arab poet and scholar
- Judith of Swabia, queen consort of Hungary (d. 1105)
- February 20 – Yaroslav the Wise, prince of Kievan Rus'
- April 19 – Pope Leo IX (b. 1002)
- August 31 – Kunigunde of Altdorf, Frankish noblewoman (b. c. 1020)
- September 24 – Hermannus Contractus, German scholar, composer, music theorist, mathematician, and astronomer
- 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.
- "Crab Nebula". NASA.
- Levtzion, Nehemia; Hopkins, John F.P., eds. (2000), Corpus of Early Arabic Sources for West Africa, New York: Marcus Weiner Press, ISBN 1-55876-241-8. First published in 1981.