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The excuse that the threat of Persia gave and Athens' wealth proved to be key in Athens consolidating power within the Delian league(Figure 1). This led to strife within the league, as the Greek cities began to revolt against Athens increased consolidation of power. Under the Athenian Pericles, the Athenians moved the treasury of the league to Athens. The city also continued to consolidate and take monetary resources, increasing its wealth and power. The cities and regions that followed Athens essentially formed an empire under Athens' leadership by the 450s. In fact, in 460 BCE, tensions were high and the Peloponnesian Wars began as rebellions of Greek cities against Athenian hegemony. The Athenians were initially successful in taking control much of the Peloponnese peninsula. However, costly wars against the Persians eventually led Athens to make peace with Persia, although they had lost many men and spent much of their wealth in being defeated in Egypt. Athenian brutality against not only those cities that revolted but also regions that were neutral, such as Melos, created further animosity with now Sparta beginning to take control of an alliance of cities against Athens. While the Athenians continued to gain power by expanding and creating colonies that were dependent on them, the Spartans began to consolidate power and even allied with the Persians as a way to counteract Athenian control. Sparta then for a league, called the Peloponnesian League, that included Corinth and other prominent cities. While Athens maintained its naval and trade supremacy, it was able to not only win key battles but also enable its wealth that fueled its ability to keep its allies and armies able to control large areas in Greece and beyond, including on the Western coast of Anatolia. [[File:2000px-Map Greco-Persian Wars-en.svg.png|thumbnail|Figure 1. Cities (in blue) that fought against the Persians and formed members of the Delian League.]]