Kohen-Zedek had opposed the Exilarchate rather than Ukba personally; he now took care that no successor should be appointed to the Exilarchate, which he desired to extinguish. His contemporary Gaon in Sora, Jacob ben Natronaï, was either too weak or too much hampered to interfere. So the office of Exilarch was left vacant for a year or two. However, hated as the Exilarchate was by the representatives of the Pumbeditha college, the people were warmly attached to the house of David, about which traditions and memories clustered. They clamored for the restoration of the office. Thereupon the Gaon of Sora took courage, and refused any longer to be a weak tool in the hands of Kohen-Zedek. The people vehemently demanded that David ben Zaccaï, a relative of Ukba, be made Exilarch, and the whole college of the school of Sora paid homage to him in Kasr, where he lived (921). Kohen-Zedek and the college of Pumbeditha refused to recognize him. David ben Zaccaï was as resolute and ambitious as his opponent, and determined to assert his authority. By virtue of his power, he deposed Kohen-Zedek, and named his successor. Once more complications arose, this time dividing the school of Pumbeditha against itself. This bickering deeply pained the better class of the people; however, the disputes between the Exilarchate and the Gaonate, affecting the whole of the Jewish-Babylonian community, lasted nearly two years. Nissi Naharvani, a blind man, who was respected by everybody for his piety, and who felt regret at this state of affairs, undertook to effect a reconciliation. Late one night he groped about till he found his way to the room of Kohen-Zedek, who was astonished at the sudden appearance of the venerable blind man at such an hour, and was persuaded by him to come to terms. Nissi then also induced the Exilarch to yield. David and Kohen-Zedek met, with their respective followers, in Sarsar (half-a-day's journey south of Bagdad), made peace, and Kohen-Zedek accompanied the Exilarch as far as Bagdad (Spring, 921). David in turn recognized Kohen-Zedek as the legitimate Gaon of Pumbeditha. Kohen-Zedek, who had not succeeded in his plan to extinguish the Exilarchate, lived to see the school of Sora, which had been humbled by him, rise again from its low position, and have fresh splendor shed upon it by a stranger from a foreign land, so that for several years it cast the school of Pumbeditha into the shade. CHAPTER VII. THE GOLDEN AGE OF JEWISH SCIENCE: SAADIAH AND CHASDAÏ.