What 2 actions angered Darius in the Persian war?

1. The Ionian Revoly by the Greek city-states within his empire.

2. The intervention in that revolt by the mainland Greek city-states of Eretria and Athens which ended up burning his provincial capital of Sardis.

3. Failure of the punitive expedition he sent against the two cities at Marathon, which led him to plan to bring all peninsular Greece within his empire to keep these cities quiet.