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Year 1131 (MCXXXI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.
Arts and culture
- January 7 – Duke Canute Lavard of Schleswig and Holstein, and ruler of the Obotrite Confederation, German saint (b. 1096)
- April 30 – Saint Adjutor, French Crusader
- August 21 – King Baldwin II of Jerusalem
- August 30 – Hervey le Breton, bishop of Bangor and Ely
- December 4 – Omar Khayyám, Persian poet, astronomer, mathematician, and philosopher (b. 1048)
- Alger of Liège, French monk at Cluny (b. 1055)
- Bohemund II of Antioch (b. 1108)
- Gaston IV of Béarn, French vassal
- Joscelin I, Count of Edessa, Crusader state ruler
- Meng, Chinese empress regent (b. 1073)
- Peter the Hermit, French priest and crusader (b. c. 1050)
- Ramon Berenguer III, Count of Barcelona (b. 1082)
- King Stephen II of Hungary (b. 1101)
- Fletcher, R. A. (1987). "Reconquest and Crusade in Spain c. 1050-1150". Transactions of the Royal Historical Society. 5. 37: 31–47. JSTOR 3679149.