The Peloponnesian League was a military alliance of city-states in the Peloponnese, led by Sparta, that was established to counter the power of Athens and its Delian League. This alliance included several prominent city-states and played a crucial role in the conflicts between Sparta and Athens, particularly during the Peloponnesian War. The league exemplified the rivalry between these two powers and showcased Sparta's dominance in the region.
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