Byzas
Βύζας
(Βύζας), a son of Poseidon and Ceroessa, the daughter of Zeus and Io. He was believed to be the founder of Byzantium. (Steph. Byz. s.v. Diod. 4.49.) This transplantation of the legend of Io to Byzantium suggests the idea, that colonists from Argos settled there. The leader of the Megarians, who founded Byzantium in n. 100.658, was likewise called Byzas. (Müller, Dor. 1.6.9.)
From William Smith (ed.), Dictionary of Greek and Roman Biography and Mythology. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.