Trojan War was reunited with Menelaus. Proteus also told Menelaus that he was destined for Elysium (Heaven) after his death. Menelaus returned to Sparta with Helen eight years after he had left Troy. Agamemnon returned home with Cassandra to Argos. His wife Clytemnestra (Helen's sister) was having an affair with Aegisthus, son of Thyestes, Agamemnon's cousin who had conquered Argos before Agamemnon himself retook it. Possibly out of vengeance for the death of Iphigenia, Clytemnestra plotted with her lover to kill Agamemnon. Cassandra foresaw this murder, and warned Agamemnon, but he disregarded her. He was killed, either at a feast or in
History of Sparta Peace of Callias. Again the Thebans refused to renounce their Boeotian hegemony, and the Spartan's sent a force under King Cleombrotus in an attempt to enforce Theban acceptance. When the Thebans gave battle at Leuctra, it was more out of brave despair than hope. However, it was Sparta that was defeated and this, along with the death of King Cleombrotus dealt a crushing blow to Spartan military prestige. The result of the battle was to transfer supremacy from Sparta to Thebes. As Spartan citizenship was inherited by blood, Sparta now increasingly faced a helot population that vastly outnumbered its citizens.