. "a male descendant of Tantalus; of Pelops ; of the grandsons of Tantalus ( Atreus and Thyestes ; of his great-grandson , Agamemnon" . "a male descendant of Tantalus; of Pelops ; of the grandsons of Tantalus ( Atreus and Thyestes ; of his great-grandson , Agamemnon" . .