Io

The Heifer Maiden; Io was the daughter of Inakhus (Inachus), the king of Argos.

Io was wooed by Zeus and eventually turned into a heifer to conceal her from Hera; when Zeus first approached Io she refused his advances; Zeus threatened Io’s father with ruin if she did not submit but she still refused; her father turned Io out of his house and, to make matters worse, Hera sent the hundred-eyed herdsman, Argos, to follow Io and a gadfly to torment her so that she would have to keep moving farther and farther from her home.

Io encountered Prometheus during her travels and he told her that eventually she would find peace but her journey would not end until she swam the Hellespont and ventured all the way to Egypt; she was relieved of her curse in Egypt and her son, Epaphos (Epaphus) was the ancestor of Aegyptus and Danaus.

For more detailed information on Io I suggest that you consult the Immortals section of this site.