In Greek mythology, Pleisthenes was the a son of Pelops. Greek mythology comprises the collected narratives of Greek gods, goddesses, heroes, and heroines, originally created and spread within an oral-poetic tradition. ... In Greek mythology, Pelops (Greek Î ÎλοÏ) was a son of Tantalus and Dione, and father of Pittheus, Plisthenes, Atreus and Thyestes. ...
Agamemnon, ("very resolute") one of the most distinguished of the Greek heroes, was the son of King Atreus of Mycenae or Argos) and Queen Aerope, and brother of Menelaus.
Another account makes him the son of Pleisthenes (the son or father of Atreus), who is said to have been Aerope's first husband.
Atreus was murdered by Aegisthus, who took possession of the throne of Mycenae and ruled jointly with his father Thyestes.