The League and the power it gave Athens over the rest of Greece were to become one of the major reasons for the Peloponnesian War against Sparta and its allies.

The Peloponnesian War ... Athens signed a treaty of mutual protection with Corcyra (modern-day Corfu) - one of the few other city-states with a major navy of its own - Sparta and its allies ...

This extremely rare gold stater of Athens, depicting Athena ... between the Persian wars and the Peloponnesian war, when it was ruled by Pericles.

These states were always squabbling and often went to war. Sparta and Athens fought a long war, called the Peloponnesian War, from 431 to 404BC. Only the threat of invasion by a foreign enemy made ...