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The Battle of the Eurymedon (c. 466 BCE, also given as the Battle of the Eurymedon River) was a military engagement between the Greeks of the Delian League and the forces of the Achaemenid Empire toward the end of the reign of Xerxes I (r. 486-465 BCE). The battle took place at the mouth of the Eurymedon River in Asia Minor (modern-day Koprucay River in Antalya Province, Turkey) and was both a naval and land engagement. The Greek forces were led by Cimon of Athens (l. c. 510 - c. 450 BCE) to a complete victory over the Persians.

The date of c. 466 BCE seems to make the most sense in light of other events – whose dates are known – which fit with this chronology.

The period is better understood as the time between the defeat of the second Persian invasion of Greece in 479 BCE and the outbreak of the Second Peloponnesian War in 431 BCE. The historians of the time, such as Thucydides, often do not provide careful chronology or developmental details in their narratives, seeming to assume an audience would already have this information.

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