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|Ab urbe condita||1804|
|Balinese saka calendar||972–973|
|English Regnal year||N/A|
|Chinese calendar||庚寅年 (Metal Tiger)|
3747 or 3687
— to —
辛卯年 (Metal Rabbit)
3748 or 3688
|- Vikram Samvat||1107–1108|
|- Shaka Samvat||972–973|
|- Kali Yuga||4151–4152|
|Japanese calendar||Eishō 6|
|Minguo calendar||861 before ROC|
|Seleucid era||1362/1363 AG|
|Thai solar calendar||1593–1594|
1177 or 796 or 24
— to —
1178 or 797 or 25
|Wikimedia Commons has media related to 1051.|
- Spring – William of Normandy consolidates his power in Normandy. He fights over the control of Maine (after the death of Count Hugh IV), and lays siege to the fortresses of Alençon and Domfront (Western France).
- May 19 – King Henry I of France marries Anne of Kiev at the cathedral of Reims. William of Normandy marries Matilda of Flanders, daughter of Count Baldwin V, which Henry sees as a threat to his throne.
- Summer – Drogo of Hauteville, count of Apulia and Calabria, meets Pope Leo IX in southern Italy – who has been sent by Emperor Henry III (the Black) to re-establish the "freedom of the Catholic Church".
- Drogo of Hauteville is forced to promise Leo IX to stop the Normans from pillaging the Lombard countryside. On his way back, Drogo is assassinated near Bovino by a Byzantine conspiracy.
- Eustace II, count of Boulogne, visits England and is receive with honour at the court by King Edward the Confessor. In Dover a fight breaks out between the Norman visitors and the locals, resulting in the deaths of several people. Edward blames the people of Dover and orders Godwin, earl of Wessex, to deal with them. Godwin refuses to obey Edward's order, and in response Edward raises an army and forces the Godwin family into exile.
- Edward the Confessor invites William of Normandy to England. It is at this point that it is thought that Edward promises the English throne to William in the event of his death.
- Heregeld is abolished by Edward the Confessor. It has been collected for many years to provide funds for defending the country from Viking raiders.
- January 22 – Ælfric Puttoc, archbishop of York
- February 28 – Humfrid, archbishop of Magdeburg
- March 14 – Gerard I, bishop of Cambrai
- March 25 – Hugh IV, count of Maine
- April 27 – Fulk Bertrand I, count of Provence
- November 7 – Rotho, bishop of Paderborn
- Bardo, German abbot and archbishop
- Bernard, margrave of the Nordmark
- Bi Sheng, Chinese artisan and inventor (b. 990)
- Drogo of Hauteville, Norman nobleman
- Jordan of Laron, bishop of Limoges
- Kálfr Árnason, Norwegian chieftain
- Ralph de Gacé, Norman nobleman
- Jim Bradbury, The Capetians: The History of a Dynasty, pp. 106–108.
- Rogers, Clifford J. (2010). The Oxford Encyclopedia of Medieval Warfare and Military Technology. Oxford University Press. p. 68. ISBN 9780195334036.