The Leagues and an Extraordinary Gentleman
Before there was the Roman Empire there was the Roman Republic. Before the Athenian Empire, there was the Delian League. Greece is split down the middle and as Athens grow more and more powerful they start a starting contest with Sparta. This episode covers approximately 478 BC – 472 BC.
Below is the territory of Athens (orange) and her allies (yellow). Notice how virtually all of the allies are on the coast, areas that are potentially subject to Persian attacks and easily accessible by Athens.
For the life of me I couldn't find this thing in English.