sentences:  The caliph however did not grant Muhammad other titles usually reserved for the Tahirid governor of Khurasan, such as the military governorship of Iraq and Baghdad ("sahib al-shurta"), but instead gave them to Muhammad ibn Abdallah.When he became governor, Muhammad was still young and rather inexperienced.Only two years after he succeeded his father, Tabaristan was lost to a Zaydi revolt under Hasan ibn Zayd ibn Muhammad, and the Tahirids were unable to recover the province.