1054

Millennium:	2nd millennium
Centuries:	10th century 11th century 12th century
Decades:	1030s 1040s 1050s 1060s 1070s
Years:	1051 1052 1053 1054 1055 1056 1057

1054 in various calendars

Gregorian calendar	1054 MLIV
Ab urbe condita	1807
Armenian calendar	503 ԹՎ ՇԳ
Assyrian calendar	5804
Balinese saka calendar	975–976
Bengali calendar	461
Berber calendar	2004
English Regnal year	N/A
Buddhist calendar	1598
Burmese calendar	416
Byzantine calendar	6562–6563
Chinese calendar	癸巳年 (Water Snake) 3751 or 3544     — to — 甲午年 (Wood Horse) 3752 or 3545
Coptic calendar	770–771
Discordian calendar	2220
Ethiopian calendar	1046–1047
Hebrew calendar	4814–4815
Hindu calendars
- Vikram Samvat	1110–1111
- Shaka Samvat	975–976
- Kali Yuga	4154–4155
Holocene calendar	11054
Igbo calendar	54–55
Iranian calendar	432–433
Islamic calendar	445–446
Japanese calendar	Tengi 2 (天喜２年)
Javanese calendar	957–958
Julian calendar	1054 MLIV
Korean calendar	3387
Minguo calendar	858 before ROC 民前858年
Nanakshahi calendar	−414
Seleucid era	1365/1366 AG
Thai solar calendar	1596–1597
Tibetan calendar	阴水蛇年 (female Water-Snake) 1180 or 799 or 27     — to — 阳木马年 (male Wood-Horse) 1181 or 800 or 28

Year 1054 (MLIV) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.

Events

• 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 – Rosdalla, Kilbeggan Ireland: Earliest known European tornado.
• 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 remains bright enough to be seen in daylight. Its remnants form the Crab Nebula (NGC 1952).
• July 16 – Cardinal Humbertus, a representative of Pope Leo IX, and Michael Cerularius, Patriarch of Constantinople, decree each other's excommunication. 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 In 1965, those excommunications are rescinded by Pope Paul VI and Patriarch Athenagoras when they meet in the Second Vatican Council.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.

Deaths

• April 19 – Pope Leo IX (b. 1002)
• September 24 – Hermannus Contractus
• Yaroslav the Wise, prince of Kievan Rus