Its location, Çanakkale Altı, and the nearby madrasah and bathhouse indicate the settlement and form of the Turks during the Seljuk period.
The mosque was built in the 14th century in the name of Devlethan, the brother of Kılıç Arslan II, and has survived to this day despite several renovations. The architect of the mosque, which displays features from the princely period, is unfortunately unknown. However, his name is mentioned in Ottoman records from 1726 onwards in connection with the people assigned to the mosque.
The mosque is constructed of hewn stones bonded with lime mortar. Architectural elements from earlier periods, such as marble blocks and inscription fragments from the archaeological site of Antioch, were reused as materials in the masonry, particularly in the foundation. This feature is most visible on the east side. The exterior is unplastered, but traces of later cement-based repairs contradict the monumentality of the mosque. The mosque has three entrances. The main entrance is located in the center of the north side, while two smaller entrances are located near the northern ends of the long east and west sides. A double row of windows on the facades provides illumination. The windows are rectangular and have brick arches. The mosque is covered with a hipped roof. The interior measures 20.75 x 24.80 meters. Entering the mosque from the main entrance, one passes under the gallery along the north side and enters the main area. An imam's room is located below the gallery in the northwest corner. The lower part of the gallery, with the exception of the imam's room, is designed as the final assembly area.