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
Siege of Sparta the Agiad throne. Plutarch, the Greek historian, attributed Cleonymus' non-selection as king to his violent disposition and arbitrariness. Moreover, Cleonymus had been slighted because his new wife, Chilonis, had been seduced by Areus' son, Arcotatus. These perceived insults spurred Cleonymus to leave Sparta and scheme to usurp the throne. Pyrrhus was receptive to Cleonymus' appeals to install him on the Spartan throne and agreed to assist him. To achieve this, the Epiriote King assembled an army numbering of 27,000 men. It consisted 25,000 infantry, 2,000 cavalry and was supplemented by 24 war elephants. The size of Pyrrhus' expedition indicates that