1150

By place

Byzantine Empire

• Battle of Tara: The Byzantines defeat the Serbian-Hungarian army under Grdeša, count of Travunija, near the snow-covered Tara River. The Serbs are overpowered, and Grand Prince Uroš II is forced to accept the peace agreement made by Emperor Manuel I. Uroš is succeeded by his brother Desa, who becomes co-ruler of the Principality of Serbia.

  Levant

• Spring - Joscelin II, count of Edessa, on his way to Antioch is separated from his escort and falls into the hands of some Turcoman free-booters. Nur al-Din, ruler of Aleppo, heard of Joscelin's capture and sends a squadron of cavalry to take him from his captors. Joscelin is led before a hostile crowd and publicly blinded. Nur al-Din puts him in prison in the Citadel of Aleppo.
• Battle of Aintab: A Crusader army led by King Baldwin III repels the attacks of Nur al-Din near Aintab. Baldwin safely evacuates the Christian residents of the County of Edessa, which is captured by the Zangids.
• The city of Ascalon is fortified with 53 towers by order of the 17-year-old Caliph Al-Zafir, as it is the most strategic frontier fortress of the Fatimid Caliphate.

  Europe

• February 8 - Battle of Flochberg: German forces under Henry VI defeat the army of the House of Welf at Bopfingen. At the same time, King Conrad III besieges Welf forces at Braunschweig in Saxony, but he lifts the siege when confronted by Henry the Lion.
• The University of Paris is founded. The first doctorate degree is awarded in Paris.
• The city of Rinteln is founded on the northern bank of the Weser River in Lower Saxony.

  Britain

• November 10 - Dryburgh Abbey located in the Scottish Borders is founded by Lord Hugh de Morville.
• Cubbie Roo's Castle is built on Wyre and is first mentioned in the Orkneyinga Saga.
• Christchurch Priory located in Hampshire is founded by Earl Baldwin de Redvers.
• The Irish Chronology is written.

  By topic

Religion

• The 15-year-old King Inge I of Norway calls for a meeting at Bergen of all religious leaders in anticipation that the English cardinal Nicholas Breakspear will find an archbishopric at Trondheim.
• Peter Lombard, a French scholastic theologian, publishes the Four Books of Sentences, which becomes the standard textbook of theology at the medieval universities.
• The temple at Angkor Wat is completed in the Khmer Empire.