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Also, Darius did not attack Greece, as there was no country of Greece. There were hundreds of independent city-states, some within the Persian Empire, some outside.
The starting problem was the Ionian Revolt where the Greek cities in Persian Asia Minor revolted and were put down.
During this revolt, Eretia and Athens, both outside the Persian Empire, gave aid to the revolting cities. Darius sent a punitive expedition in reprisal. It was defeated at Marathon.
He then planned to bring all the Greek cities under his control to put an end to Greek breaches of peace, order and prosperty. He died before mountig this attempt, but it was carried out by his son and successor Xerxes I.
