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|Centuries:||11th century – 12th century – 13th century|
|Decades:||1150s 1160s 1170s – 1180s – 1190s 1200s 1210s|
|Years:||1178 1179 1180 – 1181 – 1182 1183 1184|
|1181 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|Art and literature|
|1181 in poetry|
|Ab urbe condita||1934|
|Bahá'í calendar||−663 – −662|
|English Regnal year||27 Hen. 2 – 28 Hen. 2|
|Chinese calendar||庚子年 (Metal Rat)
3877 or 3817
— to —
辛丑年 (Metal Ox)
3878 or 3818
|- Vikram Samvat||1237–1238|
|- Shaka Samvat||1103–1104|
|- Kali Yuga||4282–4283|
|Japanese calendar||Jishō 5 / Yōwa 1
|Minguo calendar||731 before ROC
|Thai solar calendar||1724|
|Wikimedia Commons has media related to 1181.|
- Jayavarman VII defeats the Cham and assumes control of the Khmer kingdom.
- The Yowa era, marked by famine, begins in Japan.
- After a series of defeats, the Almohad navy, under the admiral Ahmad al-Siqilli, crushes the Portuguese fleet and reassert their control over the Atlantic Ocean.
- The word Albigensians is first used by chronicler Geoffroy du Breuil of Vigeois to describe the inhabitants of Albi, France.
- Philip Augustus annuls all loans made by Jews to Christians and takes a percentage for himself. A year later, he confiscates all Jewish property and expels the Jews from Paris.
- Chinese and Japanese astronomers observe what has since come to be understood as a supernova. One of only eight supernovae in the Milky Way observed in recorded history, it appears in the constellation Cassiopeia and is visible in the night sky for about 185 days. The radio source 3C58 is thought to be the remnant from this event.
- Guilhem VIII, lord of Montpellier, frees the teaching of medicine from any monopoly (January).
- September 26 – Saint Francis of Assisi, Italian founder of the Franciscan Order (d. 1226)
- Teresa of Portugal (d. 1250)
- Jochi (d. 1227)
- January 30 – Emperor Takakura of Japan (b. 1161)
- March 17 – Henry I of Champagne, count of Champagne
- June 30 – Hugh de Kevelioc, 3rd Earl of Chester, English politician (b. 1147)
- August 30 – Pope Alexander III (b. c. 1100–1105)
- Taira no Kiyomori, Japanese warlord (b. 1118)
- As-Salih Ismail al-Malik, ruler of Syria (b. 1163)
- Picard, Christophe (1997). La mer et les musulmans d'Occident VIIIe-XIIIe siècle. Paris: Presses Universitaires de France.
- Mélanges d'histoire de la médecine hébraïque, by Gad Freudenthal, Samuel S. Kottek, Paul Fenton compiled by Gad Freudenthal, Samuel S. Kottek published by BRILL, 2002 ISBN 90-04-12522-1, 9789004125223