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431 BC โ€“ 404 BC

Peloponnesian War

A tragic civil war between Athens and Sparta that ended the Golden Age of Greece and left everyone weakened.

LocationGreece, Asia Minor, Aegean Sea, Sicily
BelligerentsAthens (Delian League), Sparta (Peloponnesian League)

Context & Background

Late 5th Century BC

The Thucydides Trap

The "Thucydides Trap" is when a rising power makes the ruling power fear it must strike first. Athens was bold and expanding; Sparta, the old hegemon, grew anxious as Athenian influence spread and felt forced to act before it was too late.

431 BC

Two Leagues

The Greek world split in two. The Delian League (led by Athens) controlled the sea and the islands. The Peloponnesian League (led by Sparta) dominated the mainland. A spark was all it took.

478โ€“460 BC

After Persian Wars

Athens turned the Delian League tribute into an Athenian empireโ€”keeping the fleet ready, moving the treasury, and garrisoning allies. Many poleis grew resentful of paying for Athenian ships and walls.

464 BC

Spartan Unease

Sparta relied on its hoplite army and Helot labor. Memories of the great Helot revolt after the 464 BC earthquakeโ€”and Athens briefly meddlingโ€”made Spartans fear a growing naval empire on their doorstep.

433โ€“432 BC

Corcyra & Potidaea

Athens backed Corcyra against Corinth and forced Potidaea (a Corinthian colony) to tear down its walls. Corinth, a key Spartan ally, pushed for punishment, framing Athens as a treaty-breaker.

432 BC

Megarian Decree

Athens barred Megarian merchants from Athenian markets and ports, strangling a Spartan allyโ€™s economy. Sparta saw it as provocation; allies demanded war unless Athens repealed the decree. Athens refused.

The Narrative

The war began as a stalemate. Pericles of Athens knew they couldn't beat Sparta on land, so he pulled everyone behind the Long Walls and relied on the navy. It was a brilliant plan, until nature intervened. A plague struck the overcrowded city, killing a third of the population, including Pericles himself.

While Athens reeled, Sparta found its own hero in Brasidas. He marched through Thrace, capturing Athenian allies and even Amphipolis . When Brasidas and the Athenian commander Cleon both died there, the exhausted sides agreed to the uneasy Peace of Nicias in 421 BCโ€”a pause everyone used to rearm.

Without steady leadership, Athens grew reckless. The charismatic but dangerous Alcibiades convinced them to launch a massive invasion of Sicily. It was a catastrophic gamble. The entire Athenian fleet and army were destroyed in Syracuse โ€”a loss from which they never truly recovered.

The end was slow and agonizing. Sparta, aided by Persian gold, finally built a fleet to challenge Athens. At Aegospotami , they caught the Athenians off guard and destroyed their last ships. Starved into submission, Athens tore down its walls to the sound of Spartan flutes. The Golden Age was over.

Chronology

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History Quiz

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What was Pericles' initial strategy for Athens?