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Cyrus, Darius, Xerxes.
The King of Persia defeated by Alexander was Darius. After losing the battle of Gaugamela Darius was murdered by his own nobles.
Persia had a king, not an emperor. The Persian king Darius I was at home in Persia when the battle of Marathon took place, so he was not killed at Marathon. Darius the Great died of natural causes 14 years after Marathon.
King Darius I.
It was an expeditionary force sent by King Darius.
King Xerxes.
Darius the Great.
Xerxes mother was Atossa, Darius I of Persia wife and Cyrus the Greats' daughter.
Darius, king of Persia.
Hystaspes.
King Darius of Persia.
He would have difficulty in doing that. He was King of Persia and leading them.