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 Isthmus of Corinth in 265 BC. The defeat was so disastrous for Sparta that they would not rise to be a regional power until the reign of Cleomenes III thirty years later. Siege of Sparta The Siege of Sparta took place in 272 BC and was a battle fought between Epirus, led by King Pyrrhus, ( 297–272 BC) and an alliance consisting of Sparta, under the command of King Areus I ( 309–265 BC) and his heir Acrotatus, and Macedon. The battle was fought at Sparta and ended in a Spartan-Macedonian victory. Following his defeat in Italy by the