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| al-Ma'mun المأمون | |||||
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 Gold dinar of al-Ma'mun, minted in Egypt in 830/1 | |||||
| 7th Caliph of the Abbasid Caliphate | |||||
| Reign | 27 September 813 – 7 August 833 | ||||
| Predecessor | al-Amin | ||||
| Successor | al-Mu'tasim | ||||
| Born | 14 September 786 Baghdad, Abbasid Caliphate | ||||
| Died | 7 August 833 (aged 46) Tarsus, Abbasid Caliphate, now Mersin Province, Turkey | ||||
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| Consorts | List
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| Dynasty | Abbasid | ||||
| Father | Harun al-Rashid | ||||
| Mother | Umm Abdallah Marajil | ||||
| Religion | Mu'tazili Islam | ||||
Abū al-ʿAbbās Abd Allāh ibn Hārūn al-Maʾmūn (Arabic: أبو العباس عبد الله بن هارون الرشيد, romanized: Abū al-ʿAbbās ʿAbd Allāh ibn Hārūn ar-Rashīd; 14 September 786 – 9 August 833), better known by his regnal name al-Ma'mun (Arabic: المأمون, romanized: al-Maʾmūn), was the seventh Abbasid caliph, who reigned from 813 until his death in 833. He succeeded his half-brother al-Amin after a civil war, during which the cohesion of the Abbasid Caliphate was weakened by rebellions and the rise of local strongmen; much of his domestic reign was consumed in pacification campaigns. Well educated and with a considerable interest in scholarship, al-Ma'mun promoted the Translation Movement, the flowering of learning and the sciences in Baghdad, and the publishing of al-Khwarizmi's book now known as "Algebra". He is also known for supporting the doctrine of Mu'tazilism and for imprisoning Imam Ahmad ibn Hanbal, the rise of religious persecution (mihna), and for the resumption of large-scale warfare with the Byzantine Empire.