Ṭāhir ibn Ḥusayn (Arabic: طاهر بن الحسين, Tahir bin al-Husayn), also known as Dhul-Yamīnayn (Arabic: ذو اليمينين, "the ambidextrous"), and al-Aʿwar (Arabic: الأعور, "the one-eyed"), was a 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.
Tahir bin al-Husayn was then appointed governor of Khorasan as a reward, which marked the beginning of the Tahirids.
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