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1156

Year 1156 (MCLVI) was a leap year starting on Sunday (link will display the full calendar) of the Julian calendar.

• Spring – Raynald of Châtillon, prince of Antioch, makes an alliance with Thoros II (the Great), ruler of Armenian Cilicia. He invades Cyprus and conducts a widespread plundering of the Byzantine island.^[1] The Crusaders and the Armenian forces march up and down the island robbing and pillaging every building, church and convent as well as shops and private houses. The crops are burnt; the herds are rounded up – together with all the population – and driven down to the coast. The massacre lasts about three weeks; on the rumor of a Byzantine fleet in the offing, Raynald gives the order for embarkation. The Crusader ships are loaded with booty, and every Cypriot is forced to ransom himself.^[2]

• January 20 – Freeholder Lalli slays the English missionary-bishop Henry with an axe, on the ice of Lake KöyliönjärviinFinland (according to legend).
• February – Domenico Morosini, doge of Venice (House of Morosini), dies after an 8-year reign. He is succeeded by Vitale II Michiel as ruler of Venice.
• May 28 – King William I (the Bad) lands with a Sicilian expeditionary force in Apulia. He defeats the Byzantine army at Brindisi and recaptures Bari.
• June 9 – Emperor Frederick I (Barbarossa) marries Beatrice I, daughter of Reginald III, adding the County of Burgundy to the Holy Roman Empire.
• June 18 – Pope Adrian IV comes to terms, and signs the Treaty of Benevento. He recognises the suzerainty of William I as ruler of Sicily and Italy.^[3]
• September 17 – Frederick I makes the Margraviate of Austria a duchy and gives the Babenberg Dynasty special privileges (the Privilegium Minus).
• Yuri Dolgorukiy, Grand Prince of Kiev, founds and fortifies the town of Moscow and erects a wooden Kremlin within the settlement (approximate date).
• December 25 – King Sverker I (the Elder) is murdered on his way to church. He is succeeded by his rival, Eric IX (the Holy), as ruler of Sweden.

• The independent city-state Sfax revolts against Norman occupation. Almohad forces conquer the city and massacre the Christian citizens.^[4]

• July 28 – The Hōgen rebellion, a dispute between Emperor Go-Shirakawa and his half-brother retired-Emperor Sutoku, erupts in Japan.

• Mosan artists create the Stavelot Triptych, a masterpiece of Goldsmithing, as a reliquary to house purported pieces of the True Cross.

• January 6 – Matilda of England, daughter of Henry II (d. 1189)
• October 27 – Raymond VI, French nobleman (d. 1222)
• Abu Said al-Baji, Almohad Sufi scholar (d. 1231)
• Gaucelm Faidit, French troubadour (d. 1209)
• Hōjō Masako, Japanese noblewoman (d. 1225)
• Isaac II Angelos, Byzantine emperor (d. 1204)
• Magnus V Erlingsson, king of Norway (d. 1184)
• Robert of Auxerre, French chronicler (d. 1212)
• Sayf al-Din al-Amidi, Ayyubid jurist (d. 1233)
• Zhang Congzheng, Chinese physician (d. 1228)

• January 17 – André de Montbard, French nobleman
• January 20 – Henry, English bishop and missionary
• January 31 – Herman van Horne, bishop of Utrecht
• July 20 – Toba, Japanese emperor (b. 1103)
• August 4 – Otto IV, German nobleman (b. 1083)
• August 12 – Blanca of Navarre, queen of Castile
• November 20 – Henry I, German nobleman (b. 1115)
• December 2 – William IX, count of Poitiers (b. 1153)
• December 25
  • Peter the Venerable, French monk and abbot
  • Sverker I (the Elder), king of Sweden
• Atsiz, Persian ruler of the Khwarazmian Empire
• Domenico Morosini, doge of Venice (House of Morosini)
• Fujiwara no Sadanobu, Japanese calligrapher (b. 1088)
• Fujiwara no Taishi, Japanese empress (b. 1095)
• Fujiwara no Yorinaga, Japanese statesman (b. 1120)
• Gilbert de Gant, English nobleman (b. 1126)
• Li Qingzhao, Chinese female poet (b. 1084)
• Mas'ud I, Seljuk ruler of the Sultanate of Rum
• Minamoto no Tameyoshi, Japanese general (b. 1096)
• Tairrdelbach Ua Conchobair, Irish king (b. 1088)