Darius wanted revenge.
Greece support rebellion in Persia
hi my name is darius applewhite
He captured Athens and looted the city in 480-479 BCE.
A punitive expedition he sent to Eretria and Athens was defeated by Athens at Marathon 490 BCE.
Battle of Marathon
Xerxes was heir to Darius. What 'advice about him' means in this context I can't fathom.
First it was Darius the Great, and after he died it was taken on by his son Xerxes.
The second greco-persian war
There were three kings of Persia called Darius in the 6th, 5th and 4th Centuries BCE. Greece was not a unified country - the Greek world was comprised of 2,000 independent city-states, including Sparta, Thebes, Corinth, Athens. So there was no capital of the Greek world.