The Decelean War was the final phase of the Peloponnesian War, lasting from 413 to 404 B.C., characterized by the conflict between Athens and Sparta, primarily fought in and around the region of Decelea in Attica. This period marked a significant turning point in the war, as Sparta received support from Persia, leading to the eventual downfall of Athenian power and the establishment of Spartan hegemony over Greece.
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