|Ab urbe condita||1933|
|Balinese saka calendar||1101–1102|
|English Regnal year||26 Hen. 2 – 27 Hen. 2|
|Chinese calendar||己亥年 (Earth Pig)|
3876 or 3816
— to —
庚子年 (Metal Rat)
3877 or 3817
|- Vikram Samvat||1236–1237|
|- Shaka Samvat||1101–1102|
|- Kali Yuga||4280–4281|
|Japanese calendar||Jishō 4|
|Minguo calendar||732 before ROC|
|Seleucid era||1491/1492 AG|
|Thai solar calendar||1722–1723|
1306 or 925 or 153
— to —
1307 or 926 or 154
|Wikimedia Commons has media related to 1180.|
- 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.
- March 30 – Al-Mustadi, Abbasid Caliph of Baghdad (b. 1142)
- June – Prince Mochihito, son of Emperor Go-Shirakawa of Japan
- June 20 – Minamoto no Yorimasa, Japanese samurai (ritual suicide) (b. 1106)
- September 18 – King Louis VII of France (b. 1120)
- September 24 – Manuel I Komnenos, Byzantine Emperor (b. 1118)
- October 25 – John of Salisbury, English-born French bishop (b. c. 1120)
- November 14 – Lorcán Ua Tuathail (Laurence O'Toole), Irish archbishop, canonized (b. 1128)
- Abraham ibn Daud, Spanish-Jewish philosopher (martyred) (b. c. 1120)
- Roman I of Kiev, Russian prince
- Yaroslav II of Kiev, Russian prince
- Zhu Shuzhen, Chinese poet (b. c. 1135)