Atreus, In Greek legend, the son of Pelops. Atreus became king of Mycenae and drove out his brother Thyestes. Plagued by a curse on the house of Pelops, Atreus murdered his own son Pleisthenes and was eventually killed by the nephew he had raised as a son. Two more sons, Agamemnon and Menelaus, fought in the Trojan War.
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