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
Menelaus (son of Lagus) appointed by his brother to the chief command of the forces dispatched to Cyprus, where they were destined to co-operate with the fleet of Seleucus, and with Nicocreon, king of Salamis. By their combined efforts, they soon reduced all the cities of Cyprus to subjection, with the exception of Citium; and that also, it would appear, must have ultimately submitted. Menelaus now remained in the island, which he governed with almost absolute authority, the petty princes of the several cities being deposed, imprisoned, or assassinated on the slightest symptom of disaffection. He still held the chief command in 306 BC,