Acastus

Acastus is a character in Greek mythology. He sailed with Jason and the Argonauts, and participated in the hunt for the Calydonian Boar.
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[Greek heroic] The king of Iolcus, the oldest son of Pelias. He was one of the Argonauts. His consort Astydamea fell in love with Peleus, but when her love was unrequited she slandered him with her husband. Acastus then tried to kill Peleus but Hermes intervened and Acastus' attempt failed.