Achaean League

League of the Achaeans Κοινὸν τῶν Ἀχαιῶν Koinon ton Achaion
280 BC–146 BC
Achaean coin probably depicting a symbol of the league.
Achaean League in 192 BC
Capital	Aigion (meeting place)
Common languages	Achaean Doric Koine, Koine Greek
Religion	Ancient Greek religion
Government	Republican Confederacy
Strategos
Legislature	Achaean assembly
Historical era	Classical Antiquity
• Re-founded	280 BC
• Conquered by the Roman Republic in the Achaean War	146 BC
Currency	Drachma
Preceded by Succeeded by League of Corinth Arcadian League Achaea (Roman province)
Today part of	Greece

The Achaean League (Ancient Greek: Κοινὸν τῶν Ἀχαιῶν, romanized: Koinon ton Akhaion, lit. 'League of Achaeans') was a Hellenistic-era confederation of Greek city-states on the northern and central Peloponnese. The league was named after the region of Achaea in the northwestern Peloponnese, which formed its original core. The first league was formed in the fifth century BC. The second Achaean League was established in 280 BC. As a rival of Antigonid Macedon and an ally of the Roman Republic, the league played a major role in the expansion of Rome into Greece. This process eventually led to the League's conquest and dissolution by the Romans in 146 BC.

The League represents the most successful attempt by the Greek city-states to develop a form of federalism, which balanced the need for collective action with the desire for local autonomy. Through the writings of the Achaean statesman Polybius, this structure has had an influence on the constitution of the United States and other modern federal states.^[1]