In 499 BC several Greek cities in Asia Minor rebelled against Persian rule. To help their fellow Greeks, a few city-states in mainland Greece sent soldiers to join the fight against the Persians.

The Persians put down the revolt, but Darius was still angry with the Greeks. Although the cities that had rebelled were in Asia, Darius was enraged that other Greeks had given them aid. He swore to get revenge on the Greeks.

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