It is located in Sur County, Ozdemis Street, close to Mattar Mosque. The church, whose construction is not clearly known, is still used by Keldanis ownership connected to Catholic sect. The construction date of the Mar Petyun Church is unknown due to lack of written historical resources and tablets. There is an 1834 dated tablets, is set on the northwest corner of the door that allows entrance to the church. 1834 is accepted as the date of reparation.
The structure has gone through reparations many times. Just like seen in many structures in Diyarbakir, black basalt stone has been used as structure’s material. By means of plan, it has three nefs and five apsis divided by arches. Mar Petyum Church forms a complex structure group with added structures which are connected to each other and made of necessity. There is Mar Petyum Church, mass-building and three yards inside the complex.
The complex structure group, in which church is located in, has an irregular U shaped organization around the avlu. The basalt stoned walls of the church is in harmony with two colored baklava sliced stone floorings in front of the apsis. Besides the main structure material volcanic basalt stone, soil, wooden and lime mortar has been used as well. Block stone has been used in wall decorations. Just like every structure in Diyarbakir, lime mortar (cas) in decoration and wooden material in furniture was used to hang wished on the iron arch bodies, window rails, who’s the usage of iron. The church is open to prayers today.
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