Delian League
Soon after the League was set up, Athens began to use the League's funds for its own purposes. This led to conflict between Athens and the less powerful members of the League. By 431 BC,  the League presented a threat to Sparta. This, and Athens's heavy-handed control of the League, started the Peloponnesian War. The League was dissolved after the war's end in 404 BC by the order of Lysander, the Spartan commander.