What was the Peloponnesian League?

The Peloponnesian League was formed by several states within the Peloponnese and headed by Sparta. League states included Sparta, Corinth, Elis and Tegea. Eventually, the league included all of the Peloponnese states except Argos and Achaea. After the Persian War, it became the Hellenic League and expanded to include Athens and other states as well.