When it conquered and incorporated the Median Empire in the second half of the 6th Century BCE and was able to use the combined resources to expand to the east and west.
Persian Empire.
Persian Empire, Phoenician trading empire.
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.
The Persian Empire.
The Persian Empire was not a person.
Persian Empire.
The Persian Empire .
The Persian Empire.
The Persian Empire.
The Persian Empire and the eastern Greek city-states.
The Persian Empire.
Both the Persian Empire and Greek civilization had multiple gods responsible for different aspects of human life.
It was an empire which promoted civilisation. It encompassed several civilisations such as Egyptian and Babylonian.
Its control of an empire began in 550 BCE.
Assyria and Babylon.
The Macedonian empire.
Macedonia conquered the Persian Empire and attempted to impose Greek culture. This was partially successful, but progressively was overlaid by other incoming cultures such as Roman and then Islamic.