The building was named Chrysokephalos. The establishment dates back to 914. It is thought that this structure was built in a basilica monastery.
The essence of today's plan must have taken place in the 12th century. Researchers said the building has undergone 6 major repairs. The apse of the three-winged structure is the rounded round polygonal. There is an inner and outer narthex.
The northern entrance was built in the 14th century. The central dome sits on a necklace and has a high 12-point reel. In the city's main church, the cathedral is decorated due to the importance of the building. Frescos were rolled up today. There are mosaic decorations on the bema walls and on the floor in the style of opus sectile.
After the conquest he was converted into a mosque and perhaps Fatih performed the first Friday prayers. Fatih Madrasa was built adjacent to the building. During the Turkish period the main entrance of the mosque was taken to the north, a mihrab was placed in the middle of the south wall, a minbar was placed and a minaret was built.
The mihrab is made of stone and is rich in decoration. Geometric vibrating borders, niche and badges of muqarnas remind the examples of Seljuks. The pulpit made of walnut is a valuable work of art.
The embroidered ornaments were made at various times and inscriptions were placed at the Orta Hisar Mosque. The room in the east of the mihrab was converted into a library in 1842 and an inscription was placed on its door.