Ceroessa
Κερόεσσα
(Κερόεσσα), a daughter of Zeus by Io, and born on the spot where Byzantium was afterwards built. She was brought up by a nymph of the place, and afterwards became the mother of Byzas. (Steph. Byz. s. v. Βυζάντιον.) From this story it must be inferred, that Argos had some share in founding the colony of Byzantium, which is otherwise called a colony of Megara. (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.