The siege of Edessa took place from November 28 to December 24, 1144, resulting in the fall of the capital of the crusader County of Edessa to Zengi, the atabeg of Mosul and Aleppo. This event was the catalyst for the Second Crusade.
The County of Edessa was the first of the crusader states to be established during and after the First Crusade. It dates from 1098 when Baldwin of Boulogne left the main army of the First Crusade and founded his own principality.
Source: Wikipedia.org
Copyright: Creative Commons 3.0
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