Conquered the rest of Media and advanced towards the Zagros chains and the Babylonian plain.
The Persians are not mentioned in history before the time of Cyrus; the attempt to identify them with the Parsua, a district in the Zagros chains south of Lake Urmia, often mentioned by the Assyrians, is not tenable.
The mountains of Fars may be considered as a continuation of the Zagros and run parallel to the shores of the Persian Gulf.
This vast flat, the modern El-Jezireh, is about 250 miles in length, interrupted only by a single limestone range, rising abruptly out of the plain, and branching off from the Zagros mountains under the names of Sarazur, Hamrin and Sinjar.
From the region of the steppes the Aryans must have penetrated into the cultivable land of Eastern Iran: thence one part spread over the district of the Indus, then on again to the Ganges; another moved westward to Zagros and the borders of the Semitic world.
In the desert (as among the Arabian and Turanian nomads), in wild and sequestered mountains (as in Zagros in north Media, and Mysia, Pisidia, Paphlagonia and Bithynia in Asia Minor), and also in many Iranian tribes, the old tribal constitution, with the chieftain as its head, was left intact even under the imperial suzerainty.
By the Zagros mountain range in what is now Kurdistan and on the S.
On the other hand, among their neighbors in Zagros and the northcorresponding to the Anariacae (Non-Aryans) of the GreeksIranian names are at best isolated phenomena.