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
Theopompus of Sparta Theopompus of Sparta Theopompus () was a Eurypontid king of Sparta. He is believed to have reigned during the late 8th and early 7th century BC. Sparta was a dyarchy, having two kings at the same time, an Agiad and a Eurypontid. Theopompus was the son and successor to the Eurypontid king Nicander. The major event of his reign was the First Messenian War, which resulted in the defeat of the Messenians, for which, Pausanias reports, Tyrtaeus credits Theompompus: Pausanias reports that Theopompus was succeeded by his grandson Zeuxidamas or great-grandson Anaxidamus, Theopompus' son Archidamus having predeceased him, though there