De Incredibilibus (excerpta Vaticana)

Icarus, in the grip of youthful impetuosity and recklessness, seeking unreasonable things, and being excitable in his mind, lost hold of reality, came adrift from all reason, and was carried down into a sea of unfathomable affairs. The Greeks tell this story in another way and create the Icarian Gulf from it.

Io, the daughter of Arestor, was a priestess of Hera. When her father discovered that she was pregnant while still unmarried (for she no longer appeared virginal but seemed larger and prettier than usual because of her sexual maturity, so that the Argives called her ‘cow’), he was enraged. He put her under guard and appointed an uncle, Argos, to watch over her. Argos, because he did not sleep but remained ever-vigilant and never allowed her the opportunity to escape, was given the name ‘Panoptes’ [‘all eyes’]. But, at Io’s request, a local man named Hermaon killed Argos without being seen. Io, now free, fled with her accomplices and boarded a merchant ship. She was carried by a storm over that sea which is now called ‘Ionian’, and she passed many places until she came safely to Aeria, where she was thought a goddess on account of her beauty. So says Charax in his Hellenica.