As an historical authority, the Persian redaction of Tabari, so remarkable in many of its aspects, and achieved by Muhammad Belami or by others under his guidance, has but little value. I designate this work as "Persian Tabari" and have used it in the splendid Gotha manuscript and in Zotenberg's French translation. I have also consulted the Turkish version of Belami in a Gotha Manuscript. [Sidenote: Tabari more valuable than Firdausi.] All these writers and others present us collectively a tolerably rich and vivid portrait of Persian tradition of the Sasanide times. But the best comprehensive statement of the story of the Sasanides on the basis of this tradition is furnished us by Tabari, all his shortcomings notwithstanding and despite the pre-eminence which Firdausi's poem possesses as such. [Sidenote: Ibn Kelbi.] But in his narrative of this period Tabari had laid under contribution reports which were not of Persian origin. For the history of the Arab princes of Hira, which is so intimately related to that of the Persian empire, Tabari's chief authority was Hisham bin Muhammad called Ibn Kelbi a man who, like his father Muhammad bin Saib Kelbi before him, has rendered, however often modern criticism may take exception to the unscientific system of both the writers, the greatest service in connection with the collection of the scattered information on the history of ancient Arabs. We know of a few of the numerous writings, large and small, of Ibn Kelbi which are enumerated for us in the _Fihrist_ and which probably are at the root of Tabari's chapters. It is quite possible that Tabari borrows many of the secondary sources of Ibn Kelbi. It is surprising that the latter is cited as an authority on the Persian history itself, on the reigns of Ardeshir, Peroz, Khosrau I, Harmizd IV, Khosrau II, and Yazdegerd III. We are not cognisant of any work of his on the History of Persia. But it may be conjectured that occasionally in his history of Arabia he supplied minuter details touching contemporary Persia. An amanuensis of his, Jabala bin Salim, is noticed in the _Fihrist_ as one of the translators from Persian. Ho provided his master with material from Pahlavi books. For the History of the Arabs of that period Tabari has used a variety of other sources, most prominent among them being Muhammad Ibn Ishak who is better known as the biographer of the prophet. In this section of Tabari's great work mediately or immediately a large amount of diverse information has been brought together. It is certainly desirable and to be hoped that the criticism of the sources in this domain would make substantial progress. But the point of greatest moment even here is to test every incident or piece of information according to its origin and credibility as I have endeavoured to do in the footnotes. APPENDIX VI _LETTER OF TANSAR TO THE KING OF TABARISTAN._