Achaean League

The Achaean League was a Hellenistic-era confederation of Greek city-states located on the northern and central Peloponnese, named after the region of Achaea. While an earlier league existed in the fifth century BC, the more famous second Achaean League was established in 280 BC. It allied with Antigonid Macedon in various conflicts against the Aetolian League and Sparta, and later with the Roman Republic. A notable leader was Philopoemen, who compelled Sparta to join. The Achaean League was ultimately dissolved in 146 BC following its conquest by the Romans during the Achaean War. Its federal structure, documented by Polybius, influenced later federal states.