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 flee to Thessaloniki, where he was protected by his strong navy. Following Antigonus' flight, Pyrrhus was able to gain control of most of Macedon and Thessaly, declaring himself King of Macedon. Upon his seizure of the Macedonian throne, Pyrrhus was approached by a Spartan Prince, Cleonymus who was serving as an officer in his army. The Spartan persuaded Pyrrhus to assist him in his plot to capture Sparta. Cleonymus' motives in wanting to attack Sparta were twofold. Firstly, he bore a grudge because his countrymen had overlooked him in favour of his nephew, Areus I when determining the successor of