In Homer's Iliad, Agamemnon was a king of Mycenae and brother to Menelaus, whose wife Helen eloped to Troy with her lover Paris. Agamemnon commanded the united Greek armed forces in the Trojan War. As the Greeks were departing for Troy, they found that the winds were insufficient to set sail. In response to a prophesy that her sacrifice was demanded by the gods, Agamemnon slew his daughter Iphigenia. In revenge, Agamemnon was killed by his wife Clytemnestra and her lover Aegisthus on his return from Troy.