The fortress is located between Şehit İsa Kırış Caddesi and Behçet Kemal Çağlar Caddesi in the west of the city, on an artificial hill that rises about twelve meters above the level of the surrounding area. It was erected in the 12th century under the rule of the Seljuks on a previous building that may have come from Hittite times. Traces of a residential building were found, which can be traced back to the Karamanid period. In Ottoman times it was used and rebuilt, spoils from Islamic and Christian times were found.
Of the original three wall rings, only one with four towers has survived. Evliya Çelebi mentions the middle ring with nine gates in his 17th century travelogue Seyahatnâme. An old Anatolian residential area with low mud houses existed around the castle until the 1970s. After the restoration of the citadel in 1965, they were leveled and replaced by a park. Within this complex is the mosque Pir Ahmet Camii (also Hisar Camii or Kale Camii). Rows of seats and a stage for folklore performances were set up inside the castle.
Source: Wikipedia