Agamemnon describes Agamemnon's death at the hands of his wife Clytemnestra, who was angry at his sacrifice of their daughter Iphigenia and his keeping of the Trojan prophetess Cassandra as a concubine. Cassandra enters the palace even though she knows she will be murdered by Clytemnestra, knowing that she cannot avoid her fate. The ending of the play includes a prediction of the return of Orestes, son of Agamemnon, who will seek to avenge his father.