This is one of the earliest and best preserved examples of this type in Anatolia. The date of the original construction must be placed at the 6th century. It has an approximately square plan (14 x 14,5 m) and has three naves. The central nave was covered by a dome, while the side naves were vaulted. The apse has a round inner and three-faceted outer face. The entrance to the church is through three doors in the west. Through the north and south oriented gates in the side naves access was provided to the domed chapels joined to the eastern part of the church at a later date.