'First Athenian Alliance', commonly known as the Delian League. According to Thucydides, the official aim of the League was to "avenge the wrongs they suffered by ravaging the territory of the king". In reality, this goal was divided into three main efforts—to prepare for future invasion, to seek revenge against Persia, and to organize a means of dividing spoils of war. The members were given a choice of either supplying armed forces or paying a tax to the joint treasury; most states chose the tax.