Tahir ibn Husayn

Tahir ibn Husayn (, ), also known as Dhu'l-Yaminayn (, "the ambidextrous"), and al-A'war (, "the one-eyed"), was an Iranian general and governor during the Abbasid caliphate. Specifically, he served under al-Ma'mun during the Fourth Fitna and led the armies that would defeat al-Amin, making al-Ma'mun the caliph. He was then rewarded as governor of Khorasan, which marked the beginning of the Tahirid dynasty.