Peloponnesian League

Quick Facts: Who was Peloponnesian League?

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Peloponnesian League

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A military alliance dominated by Sparta, controlling much of the Peloponnese.

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2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

The Peloponnesian League () was an alliance of ancient Greek city-states, dominated by Sparta and centred on the Peloponnese, which lasted from c. 550 to 366 BC. It is known mainly for being one of the two rivals in the Peloponnesian War (431–404 BC), against the Delian League, which was dominated by Athens. The Peloponnesian League is the modern name given to the Spartan system of alliances, but it is inaccurate because there were members outside the Peloponnese, and it was not really a league. The ancient name of the League was "the Lacedemonians and their allies". This is misleading as well, because Sparta could have allies outside of the Peloponnesian League.

Career & Major Achievements

In its early history, Sparta expanded by conquering Laconia and Messenia and reducing their population into slavery (as helots), but the subjugation of Tegea on its northern border failed at the battle of the Fetters. Following this defeat, Sparta abandoned its military conquests and adopted a diplomatic strategy, known as the "bones policy", by appropriating the relics of mythical heroes worshipped in the Peloponnese, starting with Orestes, the son of Agamemnon, whose bones were transferred from Tegea to Sparta. This new diplomacy was likely sponsored by Chilon, ephor c. 556, who therefore enabled Sparta to present itself as the natural successor of the mythical Achaean kingdom of Agamemnon as described by Homer. Tegea then signed an alliance treaty with Sparta, which became the starting point of the subsequent Peloponnesian League. Tegea was pushed towards Sparta by its fear of Argos, its eastern neighbour.

Enduring Legacy & Impact

For the same reason, all the other neighbours of Argos rapidly concluded treaties with Sparta on the Tegean model: Mantinea, Phlieus, Corinth, Epidaurus and the other cities of Argolis. They were followed by Elis, the large city of the western Peloponnesus, and all the Arcadian communities of central Peloponnesus. By 540s, Sparta had concluded alliances with all the Peloponnesian cities, apart from Argos and Achaean cities on the northern shore. There was no collective treaty between all the members of the League. As hegemon (leader of the League), Sparta concluded a separate treaty with each member, which therefore entered the League upon its conclusion.

Historical Fact-Check Quiz: Peloponnesian League

True or False: “The Peloponnesian League was a unified political body with a single overarching treaty binding all members equally.”

Answer (FALSE ❌): Each member swore separate treaties directly with Sparta; they were not bound together by one collective agreement.

Contemporary Figures & Related Historical Timelines

• Peloponnesian Senate — Chrono-Wiki Encyclopedia Entry: Provisional governing body of the Peloponnese during the early Greek War of Independence.
• Peloponnesian War — Chrono-Wiki Encyclopedia Entry: A protracted conflict (431–404 BC) for control of Ancient Greece between Athens and Sparta.
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Frequently Asked Questions about Peloponnesian League