A priestess of Hera. Zeus fell in love with her, but Hera changed her into a white heifer (= young cow). Io was tormented by a horse-fly sent by Hera and travelled all over the earth without stopping. She was controlled by Argus, the shepherd with one hundred eyes who never slept. During the wanderings of the heifer, she arrived at a sea, named after her, the Ionian Sea, and finally in Egypt. When she arrived in Egypt, Zeus caught her up and transformed her back into a woman.
