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 step-brother, Chrysippus in their desire for the throne of Olympia.