|Covid-19|February 22 – Battle of Cassel: Robert the Frisian (son of Baldwin V) defeats his sister-in-law Richilde (widow of Baldwin VI) and her nephew Arnulf III in a succession struggle for the County of Flanders and is appointed count by King Philip.
March – Zaynab an-Nafzawiyyah marry Yusuf ibn Tashfin, leader of the Almoravids, and becomes his queen and co-regent.
April 15 – The Siege of Bari ends when Bari, the capital and last Byzantine-controlled city in the Catepanate of Italy, is captured by Italo-Norman forces under Robert Guiscard.
August 26 – Battle of Manzikert: The Byzantine Empire loses to an army of Seljuq Turks led by Alp Arslan. Byzantine civil war resulted in Turkish conquest of Anatolia.
William I of England defeats Hereward the Wake's rebellion on the Isle of Ely.
Edwin, Earl of Mercia, rebels against William I of England but is betrayed and killed, leading to the re-distribution of land within Mercia to William's subjects.
October 22 – William IX, Duke of Aquitaine, poet (d. 1126)
February 22 – Arnulf III, Count of Flanders (in battle) (b. c. 1055)
Geoffrey of Hauteville (b.c. 1020)
Domenico I Contarini, 30th Doge of the Republic of Venice
Year 1071 (MLXXI) was a common year starting on Saturday (link will display the full calendar) of the Julian calendar.
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