Peloponnesian War, (431–404 BCE), war fought between the two leading city-states in ancient Greece, Athens and Sparta. Each stood at the head of alliances that, between them, included nearly every Greek city-state. The fighting engulfed virtually the entire Greek world, and it was properly regarded by Thucydides, whose contemporary account of it is considered to be among the world’s finest works of history, as the most momentous war up to that time.
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