The Persian empire was not only the most powerful, but the most advanced. No empire, including the greek, could truly defeat it. With out Persian technology modern civilization would be way behind (in all aspects), the reason they were the best was because they created peace with war, not just savage killing, but they expanded rapidly.
Persian Empire
The Persian Empire.
The Persian Empire was not a person.
The Persian Empire absorbed the Baabylonian Empire.
Xerxes the Great was king of the Persian Empire.
the Persian empire
It was the Persian Empire.
the Persian empire was much bigger and a lot more powerful.
The Persian empire was gone before the Roman empire became powerful.
The Persian Empire, which Alexander captured and took over.
The Persian Empire absorbed the Babylonian Empire.
Persian Empire
The Persian Empire.
The Persian Empire was not a person.
The Persian Empire absorbed the Baabylonian Empire.
Alexander conquered the Persian Empire.
An empire is an empire, a war is a war.