Pedzisa mutsara unotevera: Ṭāhir ibn Ḥusayn (, "Tâhereben Hoseyn";, "Tahir bin al-Husayn"), anozivikanwawo saDhul-Yamīnayn (, "the ambidextrous"), uye al-Aʿwar (, "one-eyed"), aive mukuru weIran uye gavhuna panguva yeAbbasid caliphate. Zvikurukuru, akashanda pasi paAl-Ma'mun munguva ye
Fitna wechina uye akatungamirira mauto aizokunda al-Amin, achiita kuti al-Ma'mun ave "caliph". Akabva apiwa mubayiro wokuva gavhuna weKhorasan, izvo zvakaratidza kutanga kweumambo hwevaTahirid.