states realigned themselves with Sparta. List of members Original members (before c.504 BC) Tegea was the first ally of Sparta in the alliance that evolved into the Peloponnesian League. Corinth joined c.550. It was the most important member of the League beside Sparta. In 395, it left the League because of the Corinthian War, but returned to Sparta with the King's Peace in 387. Its departure in 366 following the Spartan defeat against Thebes at Leuctra effectively ended the League. Sicyon remained a member without interruption until 369, when it was conquered by Epaminondas. Epidaurus joined because it felt threatened by Argos. It remained a member without interruption until 366. Phleius joined because of the threat from Argos. Sparta intervened into its internal politics to protect the Phleiasian oligarchs in 384 and 381. The oligarchs then remained loyal to Sparta until 366. Halieis probably remained a member until the campaign of Epaminondas in Argolis in 369. Megara possibly joined the League thanks to the intervention of king Cleomenes I in c.519. Megara frequently shifted allegiances between Sparta and Athens. It might have left before 511, since an expedition of the Spartan general Anchimolius against Athens did not pass through the isthmus. It was possibly forced to rejoin by Cleomenes in c.510 when he unseated the tyrant Hippias from Athens, after which he also punished Megara by giving the island of Salamis to Athens. Megara left the League again in 461 following a border war against Corinth and joined the Delian League led by Athens, which precipitated the First Peloponnesian War. It rejoined in 448. Megara remained in the League until its dissolution. Aegina became member before the end of the 6th century. It left the League in 457 after its capture by Athens, and joined instead the Delian League. The city was destroyed by Athens in 431. Aegina was refounded by Lysander in 405 with the defeat of Athens and returned to the League. Troezen left the League to Athens in 457, but rejoined following the Thirty Years' Peace. It remained loyal to Sparta until 366. Hermione left the League to Athens c.450, but rejoined following the Thirty Years' Peace. It probably remained a member until the campaign of Epaminondas in Argolis in 369. Elis was one of the earliest members of the League; it had already been allied with Sparta for two centuries. Like Sparta, it had many dependent