Aetolian League The Aetolian League ( also transliterated as Aitolian League ) was a confederation of tribal communities and cities in ancient Greece centered on Aetolia in central Greece . It was established , probably during the early Hellenistic era , in opposition to Macedon and the Achaean League . Two annual meetings were held in Thermika and Panaetolika . It occupied Delphi from 290 BC and gained territory steadily until , by the end of the 3rd century BC , it controlled the whole of central Greece outside Attica . At its height , the league ' s territory included Locris , Malis , Dolopes , part of Thessaly , Phocis , and Acarnania . In the latter part of its power , certain Mediterranean city - states joined the Aitolian League such as Kydonia on Crete . The Aetolians were not highly regarded by other Greeks , who considered them to be semi - barbaric and reckless . However , their league had a complex political and administrative structure , and their armies were easily a match for the other Greek powers . According to Scholten , the Aetolian League consisted of elites at the top , but was fundamentally a society of farmers and herders . The league had a federal structure consisting of a federal council in which the level of representation was proportional to the size of a community ' s contribution to the league ' s army , a popular assembly of all citizens which met twice a year , and an inner council equivalent to a federal government . It could raise armies and conduct foreign policy on a common basis . It also implemented economic standardization , levying taxes , using a common currency and adopting a uniform system of weights and measures . Origins of the League . It is uncertain when the League was founded . It has been suggested that it may have been founded by Epaminondas . Grainger believes it was founded much later - around the time of the rise of Philip II of Macedon . After Philip ' s victory of Chaeronea Aetolia was granted Naupaktos which the Aetolians garrisoned - a level of organization that suggests some formal government rather than the loose alliance of earlier times . Alliance with Rome . The league was the first Greek ally of the Roman Republic , siding with the Romans during the First Macedonian War , and helping to defeat Philip V of Macedon at the Battle of Cynoscephalae in 197 BC , during the Second Macedonian War . However , it grew increasingly hostile to Roman involvement in Greek affairs and only a few years later sided with Antiochus III , the anti - Roman king of the Seleucid Empire , during the Roman - Syrian War . The defeat of Antiochus in 189 BC robbed the league of its principal foreign ally and made it impossible to stand alone in continued opposition to Rome . The league was forced to sign a peace treaty with Rome that made it a subject ally of the republic . Although it continued to exist in name , the power of the league was broken by the treaty and it never again constituted a significant political or military force . A Pirate State ? The Aetolian League acquired a reputation for piracy and brigandage . Though there is some recognition that Polybius was to an extent following an Achaean bias in his portrayal of the League thus , many modern historians have accepted this portrayal as in the main justified . For example , Walbank is explicit in seeing the Aetolians as systematically using piracy to supplement their income because of the meager resources of their region while Will simply assumes the truth of the charge . Grainger devotes a whole chapter to examining Aetolian involvement in piracy along with the charges that the Aetolians were temple robbers . He finds it hard to credit that Aetolia was involved in piracy given that Aetolia lacked a fleet of even the basic sort . Further by contrast with more general historians , those that have made specific studies of piracy and brigandage barely mention Aetolia . He lists the times that the Aetolians were accused of temple robbery and argues that the weight of these accusations should take into account that these are usually made by political opponents of the League and refer to occasions that were already some way in the past when the accusations were made .