Plisthenes 1, they say, was with Thyestes 1 when he was banished, and was reared by his uncle.
Atreus did not know that Plisthenes 1 was his own son; so when Thyestes 1 send the child to Atreus, the latter believing him to be his brother's son, killed him.
Others have said that Plisthenes 1 was the father of Agamemnon, Menelaus, and Anaxibia 4.