A son of Heracles and Bolbe, from whom the Thracian town of Olynthus, and the river Olynthus near the Chalcidian town of Apollonia, were believed to have received their name. (Steph. Byz. s. v. ; Athen. viii. p. 334 ; Conon, Narrat. 4, where another person of the same name is mentioned.)