The Persian leader defeated by the Greeks was Darius.
Xerxes.
The small Greek force at Thermopylae was defeated by the Persian army in 480 BCE.
At Marathon and Salamis, the Greek cities defeated the Persian forces. At Thermopylai the Persian forces defeated the Greek cities.
Persian naval forces were defeated by a Greek naval coalition under the command of the Spartan Admiral Eurybiades.
The Battle of Marathon .
Its called ''the Persian wars'' or the ''Greco-Persian wars''.
479 BCE at Plataia.
Xerxes.
The small Greek force at Thermopylae was defeated by the Persian army in 480 BCE.
At Marathon and Salamis, the Greek cities defeated the Persian forces. At Thermopylai the Persian forces defeated the Greek cities.
Persian naval forces were defeated by a Greek naval coalition under the command of the Spartan Admiral Eurybiades.
It was the Battle of Thermopylae in the Second Persian War. The Greeks won. Shortly after Thermopylae the Athenian Navy defeated the Persian Navy at Salamis, and in the next year the Persian Army was defeated by a combined Greek Army at Plataea.
The Battle of Marathon .
The Persian navy comprising Phoenician, Asian-Greek and Egyptian fleets.
Well, seeing as how this question is filled under Alexander the Great, I would assume that you should know that the leader of Macedonia, Alexander the Great, defeated the Persian empire and held the title and office of the king of Persians.
He did not become king of the Greeks, he was Hegemon (Leader). He could claim kingship of the Persian Empire when Persian emperor Darius was killed in 331 BCE.
They didn't defeat a war. They defeated the Persians in the Persian War in the eastern Mediterranean on land and sea 499-449 BCE.