KEROESSA

In Greek mythology, 'Keroessa' was a nymph (in Greek νύμφη) or Princess of Byzantion, on the Bosphorus Strait separating Europe and Asia. She was the daughter of Io and Zeus; and mother of Byzas the Magerian, founder of Byzantion, with her uncle, Poseidon.

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Zeus fell in love with Io, the daughter of Inachus, King of the City of Argos and God of the River of Argos. The King of the Gods temporarily transformed his beloved Io into a heifer in order to protect her from the wrath of his wife, Hera, Queen of the Gods. In her wanderings Io crossed the Bosphorus, giving the strait its name (''boos-foros'', which is Greek for ''cow-ford''). After reassuming her original form, Io gave birth to a girl, Keroessa, on the banks of the Golden Horn. Keroessa was brought up by the nymph Semestra and in due course she gave birth to a son, whom she named Byzas, of the sea god Poseidon, grandson of Gaea ( Mother Earth ) and Uranus ( Father Sky ), son of Cronus, elder brother of Zeus and sovereign deity of all waters from the Pillars of Hercules to the Hellespont. Keroessa's son, Byzas the Magerian, in time became the founder of Byzantium and named the Golden Horn (Greek Χρυσοκερας Khrysokeras or Chrysoceras ) after his mother.
Some ancient sources claim Keroessa as the wife of Byzas. The names Byzas and Keroessa are to be encountered in different forms throughout antiquity as place names in the Anatolian region.