To examine the religious architecture especially mosque development of the Principalities,established in Anatolia since the end of the XIII. century and having growing numbers in the XIV. century and ending in the XV. Century in general sense; determine the relationship/interaction of the samples built with previous and subsequent periods; localize the Principalities Period mosque architecture in the Anatolian-Turkish Architecture.

Chronology of the Principalities Period in Anatolia, general architectural and decorative features of the works built in the Principalities Period, typology of the mosque, architectural and decorative features of the mosques, description of the mosques, their interactions with the earlier and later periods.