Achaean League

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. Although the first Achaean League is much less well documented than its later revival, it maintained a recognizable federal structure through the early Hellenistic period, but later fell into a period of dormancy under growing Macedonian influence. The more famous second Achaean League was established in 280 BC. First it was an ally of Antigonid Macedon at the Cleomenean War, Social War and First Macedonian War and a rival of the Aetolian League and Sparta. As a rival of Antigonid Macedon and an ally of the Roman Republic since the Second Macedonian War, 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 historian and statesman Polybius, this structure has had an influence on the constitution of the United States and other modern federal states.

The first Achaean League became active in the fifth century in the northwestern Peloponnese. Its earliest organizational structure remains partly obscure, but new evidence has illuminated aspects of its government. A fragmentary inscription discovered at Aegium, dating to the fourth or possibly the very beginning of the third century BC, attests to a developed federal system that included a boule (federal council) and a board of damiourgoi (federal magistrates).

The ancient capital of the league was Helike, but after the catastrophic destruction of that city by an earthquake and tsunami in 373 BC, Aegium subsequently assumed that role. Xenophon's Hellenica reports that Achaea underwent a democratic revolution in 367 and the previous ruling class was exiled.

Although it was once widely claimed that Alexander the Great dissolved the Achaean League in 324 BC, the passage in Hypereides (Against Demosthenes 18) supposed to reference such a dissolution is now widely understood to be too ambiguous to support that interpretation. The idea is further undermined by the continued political activity of Achaea and Arcadia during the Lamian War, when they refused to join the Greeks while Boeotia did support Antipater.

The league continued to exist into the early Hellenistic period and is attested in 302 BC, when the Achaeans were listed among the members of the League of Corinth revived by Demetrius Poliorcetes. In the years following, Macedonian influence intensified in some Achaean cities while others became ruled by tyrants. This period of increasing external control appears to have been linked to Demetrius’ change in policy, signalled by his capture and fortification of Athens in 294 BC, with the planting of garrisons in Achaean cities likely occurring shortly thereafter.

Polybius records that during this time, tyrannies were established in cities such as Ceryneia and Bura, and a garrison was stationed at Aegium. Despite this interference, there is no indication that the Achaean League was formally dissolved. Historian Jakob Larsen suggests that the confederacy’s federal institutions effectively ceased to operate because so many of its member cities were under external control. This state of suspension allowed the league to resume its functions later without the need for significant constitutional changes, suggesting that some mutual understanding among the cities facilitated its reactivation when conditions allowed.

The regional Achaean League was revived in 281/0 BC by the communities of Dyme, Patrae, Pharae and Tritaea, joined in 275 by Aegium, which controlled the important sanctuary of Zeus Homarios. The league grew quickly to include the entire Achaean heartland, and after a decade it had ten or eleven members. The key moment for the League's transformation into a major power came in 251, when Aratus, the exiled son of a former magistrate of Sicyon, overthrew the tyranny in his native city and brought it into the Achaean League. Since the Sicyonians were of Dorian and Ionian origin, their inclusion opened the League for other national elements. Aratus, then only twenty years old, rapidly became the leading politician of the League. In the thirty two years between 245 and his death in 213, Aratus would hold the office of general a total of sixteen times.