the name of several kings of Bithynia. Prusias, a town of Bithynia, anciently called Cios, from a cognominal river, and giving name to the Sinus Cianus of the Propontis; rebuilt by Prusias the son of Zela, after having been destroyed by Philip the son of Demetrius: it stood on the Sinus Cianus, at the foot of Mount Arganthonius. This is the Prusias who harboured Hannibal after the defeat of Antiochus.—Of this place was Asclepiades, surnamed Prusicus, the famous physician.