Shalmaneser informs us that he took tribute from twenty-five such chiefs.

Similar tokens of submission were paid also to his son and grandson.

After this the Assyrian records are silent as to the Persians for nearly a century, and it is not until the reign of Sennacherib that we once more find them brought into contact with the power which aspired to be mistress of Asia.

At the time of their reappearance they are no longer in Armenia, but have descended the line of Zagros and reached the districts which lie north and north-east of Susiana, or that part of the Bakhtiyari chain which, if it is not actually within Persia Proper, at any rate immediately adjoins upon it.
Arrived thus far, it was easy for them to occupy the region to which they have given permanent name; for the Bakhtiyari mountains command it and give a ready access to its valleys and plains.
The Persians would thus appear not to have completed their migrations till near the close of the Assyrian period, and it is probable that they did not settle into an organized monarchy much before the fall of Nineveh.

At any rate we hear of no Persian ruler of note or name in the Assyrian records, and the reign of petty chiefs would seem therefore to have continued at least to the time of Asshur-bani-pal, up to which date we have ample records.