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In page Harun al-Rashid:

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The Barmakids were an Iranian family (from Balkh) that dated back to the Barmak, a hereditary Buddhist priest of Nava Vihara, who converted after the Islamic conquest of Balkh and became very powerful under al-Mahdi. Yahya had helped Hārūn to obtain the caliphate, and he and his sons were in high favor until 798, when the caliph threw them in prison and confiscated their land. Al-Tabari dates this event to 803 and lists various reasons for it: Yahya's entering the Caliph's presence without permission; Yahya's opposition to Muhammad ibn al Layth, who later gained Harun's favour; and Ja'far's release of Yahya ibn Abdallah ibn Hasan, whom Harun had imprisoned.[citation needed]