Gradually, however, the League was transformed into an Athenian empire. When member states such as Naxos and Thasos attempted to leave the League in the 460s BC, they were brutally suppressed. . In 459 BC, war broke out between Athens and her old enemy, Aegina. Aegina was not at that time part of the League, but was forced to join when Athens won the war the following year.
