Its only mention in Byzantine times is at the First Council of Constantinople in 381, when a bishop Attalos of Prostana was mentioned as being present.[3]: 364
Its site is located on the south face of Eğirdirsivrisi mountain, 4 km southwest of Eğirdir in Asiatic Turkey. Here, the remains of an almost circular walled acropolis have been identified, with remains of ancient temples and public buildings along with 4 inscriptions. The boundary of Prostanna's territory with nearby Parlais to the north was at Bedre, where a border stone mentioning the two towns was uncovered in 1948.[3]: 364