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 member of the doomed House of Atreus. Although early authors, such as Aeschylus refer in passing to Menelaus’ early life, detailed sources are quite late, post-dating 5th-century BC Greek tragedy. According to these sources, Menelaus' father, Atreus, had been feuding with his brother Thyestes over the throne of Mycenae. After a back-and-forth struggle that featured adultery, incest and cannibalism, Thyestes gained the throne after his son Aegisthus murdered Atreus. As a result, Atreus’ sons, Menelaus and Agamemnon, went into exile. They first stayed with King Polyphides of Sicyon, and later with King Oeneus of Calydon. But when they thought the