Acastus

Acastus (ukăs'tus) , in Greek mythology, son of Pelias, cousin of Jason. He accompanied Jason on the Argonaut expedition, but when Jason and Medea murdered Pelias and usurped the throne of Iolcus, Acastus drove them away. Later, his wife fell in love with Peleus, the father of Achilles, wh...
Found on http://www.infoplease.com/ce6/ent/A0802271.html
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