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Another one of the more prominent affairs of Zeus was with Io, who was ironically a priest priestess of Hera. When Hera the Goddess heard about this she was furious, and she turned the unfortunate Io into a white cow. Now Hera knew that Zeus would transform the white heifer back into her old female form and continue the affair. She had a 100 eyed giant Argos, to keep watch on the heifer and to tell her if Zeus tried to change her back to her human form. Zeus, as cunning as ever, sent Hermes and he lulled the 100 eyed monster to sleep and killed it. Io in the form of the white heifer escaped. The Queen of the Gods saw this and she sent a gadfly to torment the heifer. Io in the form of the cow was driven half-mad by the gadfly<ref>Powell, p. 99</ref>. It was typical of the cruelty of Hera, who was shown in the myths to be given to fits of rage. Later when Hera had become reconciled to Zeus it seems that Io was turned back into her old form by Zeus. It is believed to have married a future King of Egypt.