550 BCE.
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550 BCE when Cyrus the Great began to establish and expand it to 431 BCE when Alexander the Great took it over as the Macedonian Empire.
Cyrus the Great.King Cyrus the Great.
The greatest king of the Persian empire was Cyrus the Great.
The ruler who created the Persian Empire was Cyrus the great
Cyrus and Darius the Great both ruled over the Persian Empire