King Agamemnon of Mycenae, was the leader of the Achaean forces in the expedition against Troy.

Agamemnon (meaning "very resolute" in ancient Greek) was the son of King Atreus of Mycenae and Queen Aerope. His brother was Menelaus who was the suitor and then husband of Helen, whose beauty was renowned the world over.

Agamemnon married Clytemnestra after slaying her husband Tantalus, and with her he had two daughters: Iphigenia, and Electra, and two sons:Chrysothemis, and Orestes.

When Helen was abducted by Paris of Troy, Agamemnon became commander of the Achaeans in the ensuing Trojan War to bring her back to her husband.

Because of a conflict with the goddess Artemis ("Diana" to the Romans), Agamemnon was required to ultimately sacrifice his daughter Iphigenia in order to launch the Achaean fleet against Troy. But upon his return home ten years later, he was murdered by his wife Clytemnestra in revenge for this and other acts against her.