1145

Events

* Estimation: Merv in the Seljuk Empire becomes the largest city of the world, taking the lead from Constantinople, capital of the Byzantine Empire. [http://geography.about.com/library/weekly/aa011201a.htm]
* February 15 — Pietro Bernardo Paganelli of Montemagno, Calci is elected as Pope Eugene III, and succeeds Pope Lucius II as the 167th pope.
* Pope Eugene III issues the bull "Quantum praedecessores", calling for the Second Crusade.
* Construction begins on Notre-Dame d'Chartres Cathedral in Chartres, France.
* Kim Pusik and his team of historians finish the compilation of the Korean historical text "Samguk Sagi".
* Woburn Abbey is founded.
* Arnold of Brescia joins the revolutionary Commune of Rome, where he becomes its intellectual leader for the next decade.

Births

* Maria of Antioch, Byzantine Empress (d. 1182)
* Beatrice I, Countess of Burgundy, Empress of the Holy Roman Empire (d. 1184)
* Marie de Champagne, Countess of Champagne (d. 1198)
* Theodora Comnena, Queen of Jerusalem (approximate year)
* Frederick IV, Duke of Swabia (d. 1167)
* Pope Gregory IX (approximate year) (d. 1241)
* 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)

Deaths

* February 15 — Pope Lucius II
* Zhang Zeduan, Chinese painter (born 1085)