Dictionary of Greek and Roman Geography/Certonium
CERTO′NIUM, or CERTO′NUS (Κερτώνιον, Κερτωνός), a place in Mysia, only mentioned by Xenophon (Anab. vii. 8. § 8), on the road between Adramyttium and Atarneus. It has been conjectured that it may be the Cytonium (Κυτώνιον) of Theopompus (Steph. s. v. Κυτώνιον), But Cytonium was between Mysia and Lydia; and Xenophon's Certonus is in Mysia.[ G. L. ]