Rubuta ci gaba don wannan sakin layi - Ṭāhir ibn Ḥusayn (, "Tâhereben Hoseyn";, "Tahir bin al-Husayn"), wanda aka fi sani da Dhul-Yamīnayn (, "mai hannu biyu"), da al-Aʿwar (, "mai ido ɗaya"), ya kasance babban janar na Iran kuma gwamna a lokacin Abbasid caliphate. Musamman, ya yi aiki a karkashin al-Ma'mun a lokacin Fitna ta huɗu
kuma ya jagoranci sojojin da za su kayar da al-Amin, suna mai da al-Ma'mun "kalifa". Daga nan aka ba shi lada a matsayin gwamnan Khorasan, wanda ya nuna farkon daular Tahirid.