Year 1180 (MCLXXX) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.
The last major volcanic eruption occurs of Sunset Crater, in Arizona.
During the third year of the Jishō era of Japan, a devastating whirlwind damages Kyoto.
Emperor Antoku succeeds Emperor Takakura as emperor of Japan.
Prince Mochihito amasses a large army and instigates the Genpei War between the Taira and Minamoto clans.
Kilij Arslan II allies with Saladin after the death of Byzantine Emperor Manuel I Komnenos.
April 13 – Frederick Barbarossa issues the Gelnhausen Charter.
September 24 – Alexios II Komnenos succeeds as Byzantine Emperor on the death of his father Manuel I Komnenos.
September 18 – Philip II becomes King of France.
Afonso I of Portugal is taken prisoner by Ferdinand II of León.
The Portuguese admiral D. Fuas Roupinho wins a second victory in two years against the Almohad fleet.
Artois is annexed by France.
Frederick Barbarossa removes Henry the Lion from the Duchy of Saxony, and creates the Duchies of Westphalia and Styria.
The Wittelsbach family takes control of Bavaria.
Alexander Neckam becomes a lecturer in Paris, and writes De Natura Rerum, an early mention of chess (approximate date).
Estimation: Hangzhou, capital of Southern Song China, becomes the largest city of the world, taking the lead from Fes in the Almohad Empire.
August 6 – Emperor Go-Toba of Japan (d. 1239)
Berengaria of Castile, queen of Alfonso IX of Castile (d. 1246)
Gilbert de Clare, 5th Earl of Gloucester, English soldier (d. 1230)
King Eric X of Sweden (d. 1216) (possible date)
Xia Gui, Chinese painter (d. c. 1230) (approximate date)
March 30 – Al-Mustadi, Caliph (b. 1142)
September 18 – King Louis VII of France (b. 1120)
September 24 – Manuel I Komnenos, Byzantine Emperor (b. 1118)
October 25 – John of Salisbury, French bishop (b. c. 1120)
Abraham ibn Daud, philosopher (martyred) (b. c. 1120)
Roman I of Kiev
Yaroslav II of Kiev
Prince Mochihito, son of Emperor Go-Shirakawa of Japan
Minamoto no Yorimasa, Japanese samurai (b. 1106)
Zhu Shuzhen, Chinese female poet
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