Juliopolis or Ioulioupolis (Greek: Ἰουλιούπολις), occasionally also Heliopolis (Ἡλιούπολις),[1] was an ancient and medieval city and episcopal see in Anatolia (modern Turkey).
Augustus had rewarded him with the sovereignty over Comana (Cappadocia) for his services in war against Mark Antony, whom Cleon had earlier served and from whom he had received other lands.
[1] Emperor Justinian I (r. 527–565) undertook repairs to strengthen the city walls, that were being undermined by the nearby Skopas river (modern Aladağ Cayı).
880 the city changed its name again to Basilaion (Βασιλαίον), Basileon (Βασιλέον) or Basileion (Βασίλειον) in honour of the Emperor Basil I (r. 867–886), and a late document of the Byzantine Church refers to it by its original name of Γορδίου Κώμη.
[3] The western parts of the site now lie submerged in the Sarıyar Dam reservoir, as well as the nearby Byzantine-era bridge (Sarılar Köprüsü) over the Skopas river.