**The Celtic Invasion of Greece & The Unknown Battle of Thermopylae**

"_200 years after the Persian Wars, Greece faced another massive assault. This time, the threat came not from the east but from a Celtic invasion._"

Middleton, Neil. "The Celtic Invasion of Greece & The Unknown Battle of Thermopylae" TheCollector.com, https://www.thecollector.com/celtic-invasion-greece-thermopylae/ (accessed July 2, 2024).

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