In Greek mythology, King Atreus (Greek: Ατρεύς, Atreús) (fearless) of Mycenae was the son of Pelops and Hippodamia and father of Agamemnon and Menelaus. Collectively, his descendants are known as Atrides. Atreus and his twin brother, Thyestes, were exiled by their father for having murdered their half-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. Eurystheus had meant for their lordship to be temporary; it became permanent due to his death in conflict.