Kammala jumla mai zuwa: Wanda ya kafa daular Tahirid shi ne Tahir ibn Husayn, wani janar wanda ya taka muhimmiyar rawa a cikin
yakin basasa tsakanin abokan hamayyar kalifa al-Amin da al-Ma'mun. Shi da kakanninsa a baya an ba su ƙananan gwamnoni a gabashin Khorasan don hidimarsu ga Abbasids. A shekara ta 821, an naɗa Tahir gwamnan Khorasan, amma ya mutu ba da daɗewa ba bayan haka. Daga nan sai halifan ya nada dan Tahir, Talha, wanda gwamnatinsa ta kasance daga 822 zuwa 828. Wani dan Tahir, Abdullah, an nada shi a matsayin wali na Masar da Larabawa, kuma lokacin da Talha ya mutu a 828 an ba shi gwamnan Khorasan. An dauki Abdullah a matsayin daya daga cikin manyan sarakunan Tahirid, kamar yadda mulkinsa ya ga ci gaban noma a mahaifarsa ta Khorasan, sanannen mutane a ƙasashen gabashin Abbasid da kuma fadada tasiri saboda kwarewarsa da sassan yammacin Khalifanci.