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In 393 (or 392) BC he was sent to Tiribazus, Persian satrap of Sardis, to undermine the friendly relations then existing between Athens and Persia, offering to recognize Persian claims to the whole of Asia Minor and supremacy over Greek cities there.
In 388 BC Antalcidas, then commander of the navy went to the active assistance of Persia against Athens. The success of his naval operations in the neighbourhood of the Hellespont was such that Athens was glad to accept terms of peace (the Peace of Antalcidas), by which:
- the whole of Asia Minor, with the islands of Clazomenae and Cyprus, was recognized as subject to Persia
- all other Greek cities—so far they were not under Persian rule—were to be independent, except Lemnos, Imbros and Scyros, which were to belong, as formerly, to the Athenians.
The terms were announced to the Greek envoys at Sardis in the winter of 387/386 BC, and were finally accepted by Sparta in 386. Antalcidas continued in favour with Artaxerxes, until the annihilation of Spartan supremacy after the Battle of Leuctra diminished his influence.
A final mission to Persia, probably in 367, was a failure, and Antalcidas, deeply chagrined and fearful of the consequences, is said to have starved himself to death.
- This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Antalcidas". Encyclopædia Britannica (11th ed.). Cambridge University Press.
- This article incorporates text from the public domain 1911 edition of The New Century Book of Facts published by the King-Richardson Company, Springfield, Massachusetts.