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|1071 by topic|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Ab urbe condita||1824|
|Balinese saka calendar||992–993|
|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||992–993|
|- Kali Yuga||4171–4172|
|Japanese calendar||Enkyū 3|
|Minguo calendar||841 before ROC|
|Seleucid era||1382/1383 AG|
|Thai solar calendar||1613–1614|
1197 or 816 or 44
— to —
1198 or 817 or 45
|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.
- March – Zaynab an-Nafzawiyyah marries 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 results in the 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)
- Matilda of Scotland, first daughter of Malcolm III of Scotland and Saint Margaret (d. 1072)
- Matilda of York, 1st Countess of Derby, poet (d. 1146)
- February 22 – Arnulf III, Count of Flanders (in battle) (b. c. 1055)
- April 17 – Manuel Komnenos, Byzantine military commander (b. c. 1045)
- Geoffrey of Hauteville (b.c. 1020)
- Isabella of Urgell, queen consort of Aragon
- Domenico I Contarini, 30th Doge of the Republic of Venice
- Edwin, Earl of Mercia (killed) (b.c. 1045)