Seleucia Sidera (Greek: Σελεύκεια η Σιδηρᾶ, Seleukeia hê Sidêra; Latin: Seleucia Ferrea), also transliterated as Seleuceia, Seleukeia, and later known as Claudioseleucia, Greek Klaudioseleukeia, was an ancient city in the northern part of Pisidia, Anatolia, near the village of Bayat (old name Selef), near Atabey, about 15 km north-northeast of Isparta, Isparta Province, in the Mediterranean Region of Turkey. The city was Christianized early, its bishop, being present at the Council of Nicaea in 325. [1] The city is in ruins. Remnants of the city wall, a necropolis, and a theater can be found.