A son of Olympus, from whom Cios (Prusa) on the Propontis derived its name, as he was believed to have led thither a band of colonists from Miletus. (Schol. ad Theocrit. xiii. 30; ad Apollon. Rhod. i. 1177.) Strabo (xii. p. 564) calls him a companion of Heracles who founded Cios on his return from Colchis.