This building, once an old Byzantine church, has been converted into a mosque. The church is believed to have been constructed on the orders of Helena, the daughter of the Bizantine Emperor Phocas in the 7th cc. During the reign of Danişmendliler, this large church was converted into a mosque by Fetih Gazi, the governor of Amasya and named as Fethiye Camii. The mosque has worn out considerably in time. Fethiye Mosque which was repaired and reopened in 1956 was last restored in 2006 by the General Directorate of Charitable Foundations. In 1883, Incezade Hacı Mehmet annexed a minaret to the mosque, which originally had none. Since little has survived from the original structure of the church and remaining walls have been plastered and painted white, the identification of the features of the church has been impossible. The eastern facade of the mosque, which is aligned east/ west, is styled in a fashion to form a hexagon. The entrance is through a small door on the north facade. On the west facade, there are two rows of windows placed underneath a wide arched niche.