Answer:
Most of the credit of the rise of the Persian Empire was due to the first Achaemenid Emperor, Cyrus the Great.
Step-by-step explanation:
He founded Persia after he united the Medes and the Persians to build a great Empire. He came to power in 559 BC and because of his military and political genius, he ruled the largest empire in the ancient world. His people called him father and even people he defeated called him a "worthy ruler and lawgiver".