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Peloponnesian League

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The Peloponnesian League was a powerful alliance of ancient Greek city-states.

Peloponnesian League 506 BC
Peloponnesian League 506 BC

It was dominated by the city of Sparta. The League existed from approximately 550 BC to 366 BC. It is most famous for its role in the Peloponnesian War. This war lasted from 431 BC to 404 BC. During this conflict, the League fought against the Delian League. The Delian League was an alliance led by Athens. While historians call it a "league," it was actually a system of many individual treaties.

Map Peloponnesian War 431 BC-en
Map Peloponnesian War 431 BC-en

Sparta acted as the hegemon, or leader, of the alliance. Instead of one single treaty for everyone, Sparta made separate deals with each member. Each city swore a specific oath to the Spartans. They promised to share the same friends and enemies as Sparta. They also promised to follow the Spartans wherever they led. These treaties were intended to be permanent. Members were generally forbidden from leaving the group. The agreements also included defensive obligations. Sparta had to assist any ally attacked by a non-League member. Conversely, allies had to help Sparta if it was attacked. One special clause required allies to assist Sparta during slave revolts. This was due to the Spartan fear of the helots, who were enslaved people in Laconia and Messenia.

In its early history, Sparta grew by conquering nearby regions. They took control of Laconia and Messenia. However, an attempt to conquer Tegea failed at the Battle of the Fetters. After this defeat, Sparta shifted from military conquest to a diplomatic strategy. This was sometimes called the "bones policy." Sparta began collecting the relics of mythical heroes. They moved the bones of Orestes, the son of Agamemnon, from Tegea to Sparta. This helped Sparta appear as the successor to the mythical Achaean kingdom. Following this, Tegea signed an alliance treaty with Sparta. This treaty served as the starting point for the League. Other neighbors of Argos, such as Corinth and Mantinea, soon joined using the Tegean model.

Major changes occurred in the League's organization around 506 BC. Before this, the Spartan king Cleomenes I tried to install a tyrant in Athens. He called on the League army to march, but the campaign failed. The Corinthians returned home because they disagreed with the purpose of the mission. This failure forced Sparta to allow a congress of the League. This made the League a bicameral organization, meaning it had two assemblies. The first was the Spartan ecclesia, where Spartan citizens debated. The second was the congress of the League, where allies voted on proposals. Even if an ally voted against a proposal, they were bound by the final result. In the congress, every city's vote carried the same weight.

This new system gave certain cities significant influence. Corinth, located on the Isthmus, often used its position to guide League decisions. In 440 BC, Corinth led the allies in refusing a Spartan proposal to restart war with Athens. Some cities also used religious excuses to avoid their duties. They might claim a sacred truce or a bad omen prevented them from acting. For example, Phlious avoided a battle in 394 BC due to a sacred truce. Despite these disagreements, Sparta maintained control over the military. A Spartan king or regent usually served as the commander-in-chief. Spartan officers called xenagoi supervised the collection of troops from the allies.

Sparta also maintained its influence through social connections. They supported oligarchies, or governments ruled by a small group, in many member cities. This helped local leaders keep their power. Spartan kings like Agesilaus II also built personal friendships with foreign leaders. This practice is known as xenia, or guest-friendship. Some leaders even sent their sons to the agoge, the Spartan education system. These students became known as trophimoi xenoi. These deep personal ties helped keep the different cities connected to Spartan interests.

In 378 BC, the League underwent another major reorganization. Sparta divided the League into ten distinct military districts. Previously, there had been no middle level of administration. This change was likely intended to make the League more efficient. It also helped manage the distant region of Chalkidike. These districts helped distribute the burden of providing soldiers. Each district was required to contribute between 3,000 and 4,000 hoplites. A hoplite is a type of heavy infantry soldier. This structure meant the League could theoretically field an army of at least 30,000 men. This organized system helped the League remain a dominant force in Greece for many decades.

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File:Map Peloponnesian War 431 BC-en.svg
Map Peloponnesian War 431 BC-en.svg
File:Peloponnesian League 506 BC.png
Peloponnesian League 506 BC.png
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