Peace of Antalcidas

The Peace of Antalcidas (387 BC), also known as the King's Peace, was a peace treaty guaranteed by the Great King Artaxerxes II that ended the Corinthian War in ancient Greece.

The treaty's alternate name comes from Antalcidas, the Spartan diplomat who traveled to Susa to negotiate the terms of the treaty with the king of Achaemenid Persia. The treaty was more commonly known in antiquity, however, as the King's Peace, a name that reflects the depth of Persian influence in the treaty, as Persian gold had driven the preceding war. The treaty was the first Common Peace, in which all the cities of Greece made peace simultaneously on the basis of their individual autonomy.

By 387 BC, the central front of the Corinthian War had shifted from the Greek mainland to the Aegean, where an Athenian fleet under Thrasybulus had successfully placed a number of cities across the Aegean under Athenian control, and was acting in collaboration with Evagoras, the king of Cyprus. Since Evagoras was an enemy of Persia, and many of the Athenian gains threatened Persian interests, these developments prompted Artaxerxes to switch his support from Athens and her allies to Sparta. Antalcidas, the commander of a Spartan fleet, was summoned to Susa, along with the satrap, Tiribazus. There, the Spartans and Persians worked out the form of an agreement to end the war.

King Artaxerxes thinks it just that the cities in Asia should belong to him, as well as Clazomenae and Cyprus among the islands, and that the other Greek cities, both small and great, should be left independent, except Lemnos, Imbros, and Scyros; and these should belong, as of old, to the Athenians. But whichever of the two parties does not accept this peace, upon them I will make war, in company with those who desire this arrangement, both by land and by sea, with ships and with money.”

— Hellenica/Book 5/Chapter 1