Town in Orestis, ancient Upper Macedonia
Celetrum
Celetrum or Keletron was a town of Orestis region in Upper Macedonia, situated on a peninsula which is surrounded by the waters of a lake, and has only a single entrance over a narrow isthmus which connects it with the continent.
Celetrum has been identified with the Celaenidium or Kelainidion (Κελαινίδιον) of Hierocles. The town also bore the name of Diocletianopolis (Διοκλητιανούπολις) and Justinianopolis (Ἰουστινιανούπολις).
Text adapted from Wikipedia, CC BY-SA 4.0. Photograph: Wikimedia Commons (see Commons), Wikimedia Commons.