The siege of Edessa took place from 28 November to 24 December 1144, resulting in the fall of the capital of the County of Edessa to Imad al-Din Zengi, the atabeg of Mosul and Aleppo. This event was the catalyst for the Second Crusade.
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Imad al-Din Zengi
Imad al-Din ZengiWhere it happenedOpen in map