1054

1054 (MLIV) was a common year starting on Saturday of the Julian calendar, the 1054th year of the Common Era (CE) and Anno Domini (AD) designations, the 54th year of the 2nd millennium, the 54th year of the 11th century, and the 5th year of the 1050s decade. As of the start of 1054, the Gregorian calendar was 6 days ahead of the Julian calendar, which was the dominant calendar of the time.

Millennium:	2nd millennium
Centuries:	10th century – 11th century – 12th century
Decades:	1020s  1030s  1040s  – 1050s –  1060s  1070s  1080s
Years:	1051 1052 1053 – 1054 – 1055 1056 1057

1054 in other 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) 3750 or 3690     — to — 甲午年 (Wood Horse) 3751 or 3691
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

William the Bastard.

Events

• Chinese astronomers see a supernova being created in the Crab Nebula
• February – Battle of Mortemer: The Normans defeat a French army as it is caught stealing. King Henry I of France removes his main army from Normandy as a result.
• April 30 – Rosdalla, Kilbeggan Ireland: Earliest known European tornado.
• July 4 – The SN 1054 supernova is seen 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. Whats left of it 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 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 cancelled 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 took 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.
• East-West Schism in the Christian church, where the churches got separated and became the Catholic and the Orthodox christian churches.

Deaths

• February 20 – Yaroslav the Wise, prince of Kievan Rus
• April 19 – Pope Leo IX (b. 1002)
• September 24 – Hermannus Contractus