The Deween Castle, also known as Salahaddin's Fortress, is about 30km northeast of the city of Erbil on the way to the city of Salahaddin.
The history of the Deween Castle is not well known, but it is thought to have been built by the Zarzariya tribe who were related to the grandfather of the famed Kurdish soldier named Salahaddin. Only ruins remain of the castle with no preservation at all.[i]
[i] Anthony Ham. Middle East. Lonely Planet (2010). Retrieved 2014-07-24.