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The Saffarid dynasty did not last long after Ya'qub's death. His brother and successor, Amr bin Laith, was defeated at the Battle of Balkh against Ismail Samani in 900. Amr bin Laith was forced to surrender most of his territories to the new rulers. The Saffarids were confined to their heartland of Sistan, and with time, their role was reduced to that of vassals of the Samanids and their successors.