Gadilon (Ancient Greek: Γαδιλών), also known as Gazelon (Γαζηλών), and possibly Helega,[1] was a town in the north-west of ancient Pontus, in a fertile plain between the Halys River and Amisus.[2][3] From this town the whole district received the name of Gadilonitis, which is probably the right form, which must, perhaps, be restored in two passages of Strabo, in one of which the common reading is Galaouitis (Γαλαουῖτις),[4] and in the other Gazelotos (Γαζηλωτός).[5] It was the site of a battle between the Umayyads, led by Abd al-Aziz ibn al-Walid, and Byzantines in 713.