Year 1145 (MCXLV) was a common year starting on Monday (link will display the full calendar) of the Julian calendar.
Conquest of North Africa by the Almohads
The Banu Zayan of Tlemcen submit to the arriving Almohad armies.
The Merinids of Maghrib al-Aqsa attempt to resist the Almohads but are forced into the desert areas around the Tafilalt.
Oran falls to the Almohads.
Successful Norman raid against the Tripolitania region.
Estimation: Merv in the Seljuk Empire becomes the largest city of the world, taking the lead from Constantinople, capital of the Byzantine Empire.
February 15 – Pietro Bernardo Paganelli of Montemagno, Calci is elected as Pope Eugene III, and succeeds Pope Lucius II as the 167th pope.
Arnold of Brescia joins the revolutionary Commune of Rome, where he becomes its intellectual leader for the next decade.
Arts and culture
Kim Pusik and his team of historians finish the compilation of the Korean historical text Samguk Sagi.
Construction begins on Notre-Dame de Chartres Cathedral in Chartres, France.
Woburn Abbey is founded.
December 1 – Pope Eugene III issues the bull Quantum praedecessores, calling for the Second Crusade. At Christmas Louis VII of France announces his intention of making a pilgrimage which becomes part of the Crusade.
Maria of Antioch, Byzantine Empress (d. 1182)
Marie de Champagne, Countess of Champagne (d. 1198)
Frederick IV, Duke of Swabia (d. 1167)
Ibn Jubayr, geographer, traveler and poet (d. 1217)
Manuel Komnenos, son of Andronikos Komnenos (d. 1185)
Al-Adil I, Ayyubid-Egyptian general and ruler (d. 1218)
Amalric II of Jerusalem (d. 1205)
Sayyid Muhammad Al-Makki, ancestor of the Bukkuri Sayyids (d. 1246)
date unknown
Ruben III, Prince of Armenia (d. 1187)
Aoife MacMurrough, Irish noble, Lady of Leinster (d. 1188)
probable
Theodora Komnene, Queen of Jerusalem
Pope Gregory IX (d. 1241)
February 15 – Pope Lucius II
October 6 – Baldwin, archbishop of Pisa
Zhang Zeduan, Chinese painter (b. 1085)
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