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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


(iˈdʒɪs θəs)

a cousin of Agamemnon who seduced Clytemnestra and was later killed by Orestes.
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Noun1.Aegisthus - (Greek mythology) the seducer of Clytemnestra and murderer of Agamemnon who usurped the throne of Mycenae until Agamemnon's son Orestes returned home and killed him
Greek mythology - the mythology of the ancient Greeks
References in classic literature ?
At that moment he was thinking of Aegisthus, who had been killed by Agamemnon's son Orestes; so he said to the other gods:
Then Minerva said, "Father, son of Saturn, King of kings, it served Aegisthus right, and so it would any one else who does as he did; but Aegisthus is neither here nor there; it is for Ulysses that my heart bleeds, when I think of his sufferings in that lonely sea-girt island, far away, poor man, from all his friends.
It told of the dispute between Agamemnon and Menelaus, the departure from Troy of Menelaus, the fortunes of the lesser heroes, the return and tragic death of Agamemnon, and the vengeance of Orestes on Aegisthus.
Agamemnon could not be got to show in his classical tunic, but stood in the background with Aegisthus and others of the performers of the little play.
More localized treatments of ritual in Euripides's Electra have also cast light on its use of and response to specific practices and categories: Barbara Goff (1991), for instance, explores the ways in which Orestes's identifying scar situates him as failed initiate in comparison to the Homeric Odysseus; whereas John Porter (1990) sees a disturbing appropriation of the Buphonia ritual in Orestes's assassination of Aegisthus.
Sophocles' Electra is marked by an excessive and long-lived mourning: her father Agamemnon was brutally murdered by her mother Clytemnestra and suitor Aegisthus, the usurping king of Mycenae, and she has continued to mourn his death long past the customary grieving period.
Hugo von Hofinannsthal's text is a tale of revenge, a retelling of the ancient Orestes legend that focuses on Orestes' sister Electra and the twisted and ultimately fatal family romance that arises out of the murder of their father King Agamemnon by their mother Clytemnestra and her lover Aegisthus.
Some of these works like Pacuvius' Doulorestes, Livius Andronicus' Aegisthus and Lucius Accius' famous Clytemnestra (7) are preserved only in fragments, but we do have Seneca's Agamemnon which presents a very different Clytaemestra to that of Aeschylus' tragedy of the same name.
The opening line of Section 4, 'The Nights'--'They both needed to talk'--would seem to continue the story of Romulus and Remus, but as gradually becomes clear the focus has in fact shifted to Aegisthus and Clytemnestra, the pronominal ambiguity again suggesting the enwebment or interconnectedness of human history.
Blakeley White-McGuire, as Cassandra, balanced passion and desperation, and Maurizio Nardi portrayed Aegisthus with his typical dashing effervescence.
She's the girl who vows to avenge the death of her father, Agamemnon, at the hands of his wife, Queen Klytemnestra, and her lover Aegisthus.
Cheshire-born soprano Susan Bullock stars in the title role as the deranged princess intent on revenge for the murder of her father King Agamemnon by her mother Klytemnestra and her lover Aegisthus.