in 431 BC.]]The Delian League was an association of fifth-century BC Greek city-states (approximately 150) whose purpose was to continue fighting Persia after the Greek victory in the Battle of Plataea. According to Thucydides (1.96), 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 div