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This article is about the year 1071.
|Centuries:||10th century – 11th century – 12th century|
|Decades:||1040s 1050s 1060s – 1070s – 1080s 1090s 1100s|
|Years:||1068 1069 1070 – 1071 – 1072 1073 1074|
|1071 by topic|
|Lists of leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1824|
|English Regnal year||5 Will. 1 – 6 Will. 1|
|Chinese calendar||庚戌年 (Metal Dog)
3767 or 3707
— to —
辛亥年 (Metal Pig)
3768 or 3708
|- Vikram Samvat||1127–1128|
|- Shaka Samvat||993–994|
|- Kali Yuga||4172–4173|
|Japanese calendar||Enkyū 3
|Minguo calendar||841 before ROC
|Seleucid era||1382/1383 AG|
|Thai solar calendar||1613–1614|
|Wikimedia Commons has media related to 1071.|
- 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.
- April 15 – 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.
- 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