The Nāṣirī Generations 11: II. TALHAH, SON OF TAHIR-I-ZU-L-YAMANAIN.

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When the Khalifah Mamun, became aware of the death of Tahir, he sent letters patent to Talhah, confirming him in the government of Khurasan, together with a robe of honour. He held the government until 213 H.; and, when the end of his life drew near, he bequeathed the government of Khurasan to Muhammad, son of Al-Hasan, son of Mus’ab, At-Tahiri, who was Talhah’s paternal uncle, and soon after died.
During his [Talhah’s] lifetime, the Khariji or heretic, Hamzah, broke out into rebellion in Sijistan and Talhah carried on hostilities against him for a considerable period; and what he did in Khurasan, during the Khilafat of Mamun, was the cause of his name being remembered with gratitude in that country, where numerous proofs of his goodness remained.