Humanities › History & Culture Agamemnon, the Greek King of the Trojan War Share Flipboard Email Print Pierre-Narcisse Guérin / Public Domain / Wikimedia Commons History & Culture Ancient History and Culture Mythology & Religion Figures & Events Ancient Languages Greece Egypt Asia Rome American History African American History African History Asian History European History Genealogy Inventions Latin American History Medieval & Renaissance History Military History The 20th Century Women's History View More By N.S. Gill Ancient History and Latin Expert M.A., Linguistics, University of Minnesota B.A., Latin, University of Minnesota N.S. Gill is a Latinist, writer, and teacher of ancient history and Latin. She has been featured by NPR and National Geographic for her ancient history expertise. our editorial process N.S. Gill Updated November 10, 2019 Agamemnon (pronounced a-ga-mem'-non), was the leading king of the Greek forces in the Trojan War. He became king of Mycenae by driving out his uncle, Thyestes, with the help of King Tyndareus of Sparta. Agamemnon was a son of Atreus, the husband of Clytemnestra (a daughter of Tyndareus), and the brother of Menelaus, who was the husband of Helen of Troy (Clytemnestra's sister). Agamemnon and the Greek Expedition When Helen was abducted by the Trojan prince Paris, Agamemnon led the Greek expedition to Troy to take back his brother's wife. In order for the Greek fleet to set sail from Aulis, Agamemnon sacrificed his daughter Iphigenia to the goddess Artemis. Clytemnestra Seeks Revenge When Agamemnon returned from Troy, he wasn't alone. He brought with him another woman as a concubine, the prophetess Cassandra, who was famous for not having her prophecies believed. This was at least a third strike for Agamemnon as far as Clytemnestra was concerned. His first strike had been killing Clytemnestra's first husband, the grandson of Tantalus, in order to marry her. His second strike was killing their daughter Iphigenia, and his third strike was flagrant disregard shown for Clytemnestra by parading another woman in her home. No matter that Clytemnestra had another man. Clytemnestra and her lover (Agamemnon's cousin), killed Agamemnon. Agamemnon's son Orestes took revenge by killing Clytemnestra, his mother. The Furies (or Erinyes) took vengeance on Orestes, but in the end, Orestes was vindicated because Athena judged that killing his mother was less heinous than killing his father.