The question is confused. The first king of the Persian empire was Cyrus. The king during the punitive expedition against Athens and Eretria in 490 BCE was Darius. The king during the invasion of Greece 480-479 BCE was Xerxes.
It was: Cyrus the Great. He was the founder of the Persian Empire under the Achaemenid dynasty.
Persia
First King Agesilaus I of Sparta, but he was recalledto deal with troubles in Greece. Then King Philip II of Macedonia, but he was assassinated before he could get his invasion going. Then his son Alexander III (the Great) who successfully took over the Persian Empire.
First Susa, then Persepolis.
First Susa, then Persepolis.
Xerxes I.
The first Persian invasion of Greece was during the Persian Wars in 492 BCE. It was ordered by the Persian King Darius I to punish the city-states of Athens and Eretria.
Xerxes I.
Darius I .
First Persian invasion of Greece happened in -492.
Alexander's father Philip II of Macedonia established control of mainland Greece and planned to conquer the Persian Empire. He was assassinated before he left to do this, and his son Alexander took over the task.
The Persian Empire versus a coalition of Greek city-states led first by Sparta, then Athens.
Other than the knowledge that they were the first people to successfully resist the might of the Persian Empire, Greece had no gains from the Second Persian War. The Greeks were the defenders here, and they defended their culture and autonomy.
It was: Cyrus the Great. He was the founder of the Persian Empire under the Achaemenid dynasty.
Progressively during the Second and First Centuries BCE.
Persia
The Ionian city-states were induced to revolt against Persian rule, and it spread to mainland Greece. The major players were the Persian Empire and varying coalitions of Greek city-states led first by Sparta, then Athens.