Thirty Years' Peace

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The Thirty Years' Peace was a treaty, signed between the ancient Greek city-states Athens and Sparta, in the year 445 BCE. The treaty brought an end to the conflict commonly known as the First Peloponnesian War, which had been raging since 460.

The Thirty Years' Peace, however, only lasted 13 years: for in the year 432, Athens attacked and defeated a Spartan ally at the Battle of Potidaea; and this victory, coupled with recent Athenian trade sanctions against the Spartan ally Megara, prompted the Spartans to declare that the Athenians had violated the treaty, thus declaring war. At which point the Thirty Years' Peace was aborted, and the second Peloponnesian War (commonly known as the Peloponnesian War) began.