Thirty Years' Peace

The Thirty Years' Peace was a treaty signed between the ancient Greek city-states of Athens and Sparta in 446/445 BC.

Ultimately, the peace treaty failed in achieving its goal, with the outbreak of the Second Peloponnesian War in 431 BC.

Athens was forced to give up all possessions in the Peloponnese, which included the Megarian ports of Nisaea and Pagae with Troezen and Achaea in Argolis, but the Spartans agreed to allow the Athenians to keep Naupactus.

During the peace, the Athenians took steps in undermining the truce by participating in the dispute over Epidamnus and Corcyra in 435 BC, which angered the Corinthians, who were allies of Sparta.

Athens put into effect trade sanctions against the Spartan ally Megara for participating in the Corinthian-Corcyran dispute.

The rebels quickly secured the support of a Persian satrap, and Athens found itself faced with the prospect of revolts throughout its empire.