Abu al-Abbas Abd Allah ibn Harun al-Rashid, better known by his regnal name al-Ma'mun, was the seventh Abbasid caliph, who reigned from 813 until his death in 833.
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Abu al-Abbas Abd Allah ibn Harun al-Rashid, better known by his regnal name al-Ma'mun, was the seventh Abbasid caliph, who reigned from 813 until his death in 833.