Mantash Fortress, one of the fortresses of the Bagratuni period, is located 7 km south of the city of Ijan, on the top of a forested mountain on the right bank of the Aghst River, and is surrounded by wide, pyramidal walls. The castle had two entrances, the doors of which were made of large stones. The foundations of the structures can be seen in both parts of the castle. In historical sources, Mantash Fortress is always mentioned together with Kayan Fortress, from which it can be assumed that it was built in the first quarter of the X century. The castle had two floors, like a staircase, and the first floor was quite spacious. Another rock climbed from the north, on which the second step of the castle, the citadel, was located.