Aegisthus(redirected from Aegistheus)
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n. Greek Mythology
The son of Thyestes and lover of Clytemnestra. He helped Clytemnestra kill her husband Agamemnon upon Agamemnon's return from the Trojan War.
(Classical Myth & Legend) Greek myth a cousin to and the murderer of Agamemnon, whose wife Clytemnestra he had seduced. He usurped the kingship of Mycenae until Orestes, Agamemnon's son, returned home and killed him
a cousin of Agamemnon who seduced Clytemnestra and was later killed by Orestes.