Achaean League

The most sophisticated federal state of the ancient world, and the one Rome dismantled to make an example. The league revived around 280 BCE among small cities of the northern Peloponnese and grew far beyond its original region, admitting non-Achaean members including Sicyon and, after Aratus scaled its citadel by night in 243, Corinth. Its institutions genuinely pooled sovereignty: a common citizenship, shared coinage, weights and measures, an assembly open to all members, and an elected general with annual term limits - a structure the framers of the American constitution studied and discussed by name. The league's dilemma was Sparta. To resist Cleomenes III, Aratus invited Macedon back into the Peloponnese in 224, trading independence for security in a way that defined the rest of its history. Under Philopoemen it reached its greatest extent, covering nearly the whole peninsula. Rome then used it as a lever against Macedon and, when it proved insufficiently obedient, deported a thousand leading Achaeans to Italy - among them Polybius, who wrote his history there. The final war in 146 ended with the destruction of Corinth, its population sold and its art shipped to Rome. Greece became a Roman province. Polybius's account is the fullest surviving analysis of a federal constitution from antiquity. Aigion served as its regular meeting place. Membership eventually included Megalopolis, Argos and Corinth. Its silver coinage carried a common league type alongside each city's mark. Aratus was elected general in alternate years for over three decades, working around the term limit.

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