Thyestes killed Atreus. While Thyestes ruled Mycenae, the sons of Atreus, Agamemnon and Menelaus, were exiled to Sparta. There, King Tyndareus accepted them as the royalty that they were. Shortly after, he helped the brothers return to Mycenae to overthrow Thyestes, forcing him to live in Cytheria, where he died. As a token of good will and allegiance, King Tyndareus offered his daughters to Agamemnon and Menelaus as wives, Clytemnestra and Helen respectively. When Agamemnon left Mycenae for the Trojan War, Aegisthus seduced Agamemnon's wife, Clytemnestra, and the couple plotted to kill her husband upon his return. They succeeded, killing Agamemnon
Helen of Troy (miniseries) agree to the oath and Agamemnon's brother Menelaus wins. Agamemnon is visibly jealous. Meanwhile, Paris' favorite bull is taken for the Trojan tribute games. Paris insists on competing, despite his father's protests. After winning in every competition and being recognized by his sister Cassandra, Paris is welcomed by an overjoyed to Troy. Cassandra, a seer, as well as his elder brother Hector are upset at their father's decision. Paris is sent to Sparta to draw out a peace treaty with Sparta, Menelaus alone, which angers Agamemnon. His treaty is refused and both Menelaus and Agamemnon plot to have him murdered.