The County of Edessa was one of the Crusader states in the 12th century, differing from the other Crusader states in that it was landlocked and not on particularly good terms with its closest neighbor, the Principality of Antioch. Half of the county, including its capital, was located east of the Euphrates, far to the east of the others, rendering it particularly vulnerable. The part west of the Euphrates was controlled from the stronghold of Turbessel.