CYRUS THE GREAT Cyrus(died 529BC) was the founder of the Persian Empire. He became king of the Persians while they were still just a small Aryan tribe subject to the Medes. In 550BC he overthrew Media and in 546BC captured Croesus,King of Lydia and became the master of the whole of Asia Minor,including Greek cities on the coast. Finally, in 539BC he captured Babylon and Syria.