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Peloponnesian War (431–404 BC)

Resentment by other cities at the hegemony of Athens led to the Peloponnesian War in 431, which pitted Athens and her increasingly rebellious sea empire against a coalition of land-based states led by Sparta. The conflict marked the end of Athenian command of the sea. The war between Athens and the city-state Sparta ended with an Athenian defeat after Sparta started its own navy.

Athenian democracy was briefly overthrown by the coup of 411, brought about because of its poor handling of the war, but it was quickly restored. The war ended with the complete defeat of Athens in 404. Since the defeat was largely blamed on democratic politicians such as Cleon and Cleophon, there was a brief reaction against democracy, aided by the Spartan army (the rule of the Thirty Tyrants). In 403, democracy was restored by Thrasybulus and an amnesty declared.