Because Thyestes lay with Aerope, Atreus' wife, he was banished from the kingdom by his brother Atreus. He sent Atreus' son, Pleisthenes, whom he had reared as his own, to Atreus to be killed. Thus Atreus, believing him to be his brother's son, unknowingly killed his own son.
- Hyginus. Fabulae, 88.