In Greek mythology, Thyestes was the son of Pelops, King of Olympia, and Hippodamia and father of Pelopia and Aegisthus. Thyestes and his twin brother, Atreus, were exiled by their father for having murdered their step-brother, Chrysippus in their desire for the throne of Olympia. They took refuge in Mycenae, where they ascended to the throne upon the absence of King Eurystheus, who was fighting the Heracleidae.