Agamemnon was the king of Mycenae and Argos who commanded the Greek forces during the Trojan War. He sacrificed his daughter Iphigenia to appease the goddess Artemis to allow the expedition to sail to Troy. During the war, he led the Greeks to several victories but faced setbacks due to conflicts with Achilles. Upon his return home, Agamemnon was murdered by his wife Clytemnestra and her lover Aegisthus, leading to further revenge killings by his son Orestes.