Other Guebres occupied themselves privately with the collection of these traditions; and, when a prince of Persian origin, Yakub ibn Laith, founder of the Saffarid dynasty, succeeded in throwing off his allegiance to the caliphate, he at once set about continuing the work of his illustrious predecessors.
The dismemberment of the empire continued fast in these years, and the caliph was compelled to recognize the virtual independence of the governors Ya`qub the Saffarid (see Saffarids and Persia, History, § B) in Seistan, and Ahmad b.
The great power long wielded by the Tahirids, not only in the eastern provinces, but also at Bagdad itself, had been gradually diminishing, and came to an end in the year 873, when Ya`qub the Saffarid occupied Nishapur and imprisoned Mahommed b.
Laith al-Saffar, who with the approbation of the caliph founded a dynasty, the Saffarid (q.v.), in Seistan.
His successor Motamid was attacked by the Saffarid Yakub who however was compelled to flee (see CALIPHATE: C, Is).