Artaphernes I.
Darius the Great.
Artaxerxes I.
Xerxes II.
Plataea of the last battle in the Persian war.
Leonidas I, King of Sparta, is the king who died in a battle protecting Sparta from the Persian War.
First identify what the First Persian War was.
Xerxes I.
There were no separate First, Second and Third Persian Wars. There was a Persian War of several phases over 50 years, ranging from revolt, punitive expedition, invasion and island warfare. Which part are you asking about.
By the Persian king Xerxes.
Xerses
On tthe Persian side, the Persian king. On the Greek side, first Sparta, then Athens.
For the first phase King Darius I. After his death, it was his successor King Xerxes.