For the moment we must follow the Aryans. Under the leadership of Zarathustra (or Zoroaster) who was their great teacher many of them had left their mountain homes to follow the swiftly flowing Indus river on its way to the sea.
THE STORY OF A WORD
Others had preferred to stay among the hills of western Asia and there they had founded the half-independent communities of the Medes and the Persians, two peoples whose names we have copied from the old Greek history-books. In the seventh century before the birth of Christ, the Medes had established a kingdom of their own called Media, but this perished when Cyrus, the chief of a clan known as the Anshan, made himself king of all the Persian tribes and started upon a career of conquest which soon made him and his children the undisputed masters of the whole of western Asia and of Egypt.
Indeed, with such energy did these Indo-European Persians push their triumphant campaigns in the west that they soon
