Priestess of Hera
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Io, daughter of Inachus, king of Argos, was a priestess of Hera.
She was very beautiful, and Zeus, who was much attached to her, transformed her into a white cow, in order to defeat the jealous intrigues of Hera, who, however, was not to be deceived. Aware of the stratagem, she contrived to obtain the animal from Zeus, and placed her under the watchful care of a man called Argus-Panoptes, who fastened her to an olive-tree in the grove of Hera. He had a hundred eyes, of which, when asleep, he never closed more than two at a time; being thus always on the watch, Hera found him extremely useful in keeping guard over Io. Hermes, however, by the command of Zeus, succeeded in putting all his eyes to sleep with the sound of his magic lyre, and then, taking advantage of his helpless condition, slew him.
Tormented by Hera
The story goes, that in commemoration of the services which Argus had rendered her, Hera placed his eyes on the tail of a peacock, as a lasting memorial of her gratitude. Ever fertile in resource, Hera now sent a gadfly to worry and torment the unfortunate Io incessantly, and she wandered all over the world in hopes of escaping from her tormentor.
At length she reached Egypt, where she found rest and freedom from the persecutions of her enemy. On the banks of the Nile she resumed her original form and gave birth to a son called Epaphus, who afterwards became king of Egypt, and built the famous city of Memphis.
From: Berens, E.M. The Myths and Legends of Ancient Greece and Rome. New York: Maynard, Merril, & Co., 1880. Text in the public domain.