Events

• Estimation: Merv in the Seljuk Empire becomes the largest city of the world, taking the lead from Constantinople, capital of the Byzantine Empire.^*
• Pope Lucius II is succeeded by Pope Eugene III
• Pope Eugene III issues Quantum praedecessores, calling for the Second Crusade
• Construction begins on Notre-Dame d'Chartres in Chartres, France
• Kim Pusik and his team of historians finishes compilation of the Korean historical text Samguk Sagi.
• Woburn Abbey 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 (died 1182)
• Marie de Champagne, Countess of Champagne
• Theodora Comnena, Queen of Jerusalem
• Pope Gregory IX (died 1241)
• Al-Adil I, Ayyubid-Egyptian general and ruler (died 1218)
• Amalric II of Jerusalem

Deaths

• February 15 - Pope Lucius II

1145

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