…supported by an Iranian, al-Faḍl ibn Sahl, whom he was to make his vizier, as well as by an Iranian general, Ṭāhir. Ṭāhir’s victory over al-Amīn’s army on the outskirts of the present Tehrān allowed al-Maʾmūn’s troops to occupy western Iran. Al-Amīn appealed in vain to new troops recruited…
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