Pleisthenes
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In Greek mythology, Pleisthenes was either the son of Pelops, or the son of Pelop's son Atreus (in which case he, rather than Atreus, was thought of of the father of Agamemnon and Menelaus). His wife was either Aerope or Cleolla, daughter of Dias, another son of Pelops.
Pleisthenes was also sometimes said to be the bastard son of Thyestes and Aerope and brother of Tantalus.
Another Pleisthenes, a son of Atreus, was believed to have been killed by Thyestes.