Fortress of Kaysun
The Fortress of Kaysun (Turkish: Keysun Kalesi) is located near the village of Çakırhüyük, which used to be named Keysun, in the Adıyaman Province of rural southeastern Turkey. The fortress was a stronghold of the crusader County of Edessa. In 1131, the Danishmend Gümüshtigin besieged the place. Joscelin I, Count of Edessa, hastened to relieve the defenders and died somewhere in the vicinity.
- Köy Köy Türkiye Yol Atlası (Istanbul: Mapmedya, 2006), map 171.
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