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Year 1180 (MCLXXX) was a leap year starting on Tuesday (link will display the full calendar) of the Julian calendar.

Events

September 24 – Emperor Manuel I (Komnenos) dies after a 37-year reign at Constantinople. He is succeeded by his 11-year-old son Alexios II – who will reign briefly as ruler of the Byzantine Empire with his mother, Maria of Antioch as regent (until 1183). Maria takes as her advisor and lover, Alexios Komnenos, a nephew of Manuel, causing a scandal among the Byzantine population.^[1]

January 13 – Henry the Lion, duke of Saxony, loses his Saxon and Bavarian duchies and all his imperial fiefs at an Imperial Diet in Würzburg for having breached the king's peace. Emperor Frederick I (Barbarossa) issues the Gelnhausen Charter on April 13. He breaks up Henry's former domain; one part of Saxony is renamed the Duchy of Westphalia, and other parts are given to his ally Otto I (the Redhead), duke of Bavaria.
September 18 – King Louis VII (the Younger) dies after a 43-year reign at Paris. He is succeeded by his 15-year-old son Philip II, who becomes sole ruler of France (until 1223).
The Portuguese admiral D. Fuas Roupinho wins a second victory in two years, against the Almohad fleet.^[2]
The assembly traditionally regarded as the first Sejm of the Kingdom of Poland convenes at Łęczyca (approximate date).

Portsmouth is founded by the Norman merchant Jean de Gisors, establishing a trade route between England and France (approximate date).

Summer – King Baldwin IV (the Leper) sends messengers to Saladin with proposals of a peace treaty. Because of a terrible drought, the whole of Syria is faced with famine. Saladin agrees to a two-year truce. Raymond of Tripoli denounces the truce, but is compelled to accept it after an Ayyubid fleet raids the port of Tartus.^[3]
Saladin intervenes in a quarrel between the Zangids of Mosul and the Artuqids. He convinces the Seljuks of the Sultanate of Rum not to interfere and raids Cilician Armenia.^[4]
Baldwin IV marries his sister Sibylla to Guy of Lusignan, brother of the constable Amalric of Lusignan, and enfeoffed him with the County of Jaffa and Ascalon.^[5]

March 18 – Emperor Takakura is forced to abdicate by Taira no Kiyomori after a 12-year reign. He is succeeded by his 2-year-old son Antoku as emperor of Japan (until 1185). Kiyomori rules in his name as regent.
Genpei War: Prince Mochihito begins a revolt against the Taira clan. In support, Minamoto no Yorimasa sends out a call for aid, and to the monasteries (Enryaku-ji, Mii-dera and others) that Kiyomori has offended.^[6]
June 20 – Battle of Uji: Mochihito and Minamoto no Yorimasa go into hiding in the Byōdō-in Temple. There, they seek help from the warrior monks to join the battle but are defeated and killed by the Taira forces.
September 14 – Battle of Ishibashiyama: Taira forces (3,000 men) under Ōba Kagechika defeat Minamoto no Yoritomo during a night attack near Mount Fuji (modern-day Odawara) but he flees by sea to Chiba.^[7]
November 9 – Battle of Fujigawa: Minamoto forces (30,000 men) under Minamoto no Yoritomo defeat Taira no Koremori during a night attack near the Fuji River but he escapes safely with the routed army.^[8]

Alexander Neckam becomes a lecturer in Paris, and writes De Natura Rerum, an early mention of chess (approximate date).

Hangzhou, capital of Southern Song China, becomes the largest city of the world, taking the lead from Fez in the Almohad Caliphate.^[9]

January 23 – Eberhard I, count of Berg-Altena (b. 1140)
January 29 – Soběslav II, duke of Bohemia (b. 1128)
February 6 – Teresa Fernández de Traba, queen of León
March 27 – Al-Mustadi, caliph of the Abbasid Caliphate (b. 1142)
June 20
- Minamoto no Yorimasa, Japanese military leader (b. 1106)
- Mochihito, Japanese prince and son of Go-Shirakawa
June 27 – Turan-Shah, Ayyubid emir (prince) of Damascus
July 1 – Stephanie (the Unfortunate), Spanish noblewoman
August 11 – William of Sens (or Guillaume), French architect
September 18 – Louis VII (the Younger), king of France (b. 1120)
September 24 – Manuel I (Komnenos), Byzantine emperor (b. 1118)
October 6 – Amalric of Nesle, French prelate and Latin patriarch
October 25 – John of Salisbury, English philosopher and bishop
November 14 – Lorcán Ua Tuathail, Irish archbishop (b. 1128)
Abraham ibn Daud, Spanish-Jewish philosopher (b. 1110)
Abū Ṭāhir al-Silafī, Fatimid scholar and writer (b. 1079)
John Tzetzes, Byzantine poet and grammarian (b. 1110)
Joscelin of Louvain, Flemish nobleman (b. 1121)
Raynerius of Split, Italian monk and archbishop
Zhu Shuzhen, Chinese poet and writer (b. 1135)

^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, pp. 347–348. ISBN 978-0-241-29876-3.
^ Picard, Christophe (1997). La mer et les musulmans d'Occident VIIIe-XIIIe siècle. Paris: Presses Universitaires de France.
^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, p. 343. ISBN 978-0-241-29876-3.
^ David Nicolle (2011). Osprey: Command 12 - Saladin, p. 24. ISBN 978-1-84908-317-1.
^ Steven Runciman (1952). A History of The Crusades. Vol II: The Kingdom of Jerusalem, p. 346. ISBN 978-0-241-29876-3.
^ Sansom, George (1958). A History of Japan to 1334. Stanford University Press. pp. 277–281. ISBN 0804705232.
^ Turnbull, Stephen (1998). The Samurai Sourcebook. Cassell & Co. p. 200. ISBN 1854095234.
^ Turnbull, Stephen (1977). The Samurai, A Military History. MacMillan Publishing Co., Inc. p. 53. ISBN 0026205408.
^ "Geography at about.com". Archived from the original on August 18, 2016. Retrieved March 1, 2006.

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