Teispes 650–625 BC Cyrus I 625–580 BC Cambyses I 580–559 BC Cyrus II 559–530 BC Cyrus the Great was the most notable ancient Persian king and one of the most celebrated strategists and rulers of all time. Cyrus at the height of his reign was simultaneously King of Persia, King of Babylon, King of Media and "King of the Four Corners of the World". Cambyses II 530–522 BC Conquered Egypt at the Battle of Pelusium, thus adding Pharaoh of Egypt to the titles of Persian kings.