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Delian League - Wikipedia
Peloponnesian League - Wikipedia
List of Greek flags - Wikipedia
Peloponnesian War: Facts, Dates, Causes & Who Won - HistoryExtra
Ancient Greek civilization - Sparta, Athens, City-States
Peloponnesian League | Athenian, Spartan, Confederacy
What to Know About the Peloponnesian League - Greek Boston
The Peloponnesian League: A Study of Ancient Greek Alliances
Peloponnesian League - World History Encyclopedia
Peloponnesian League Timeline - World History Encyclopedia