Al-Ma'mun

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al-Ma'mun المأمون
Caliph Commander of the Faithful
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	(786-09-14)14 September 786 Baghdad, Abbasid Caliphate
Died	7 August 833(833-08-07) (aged 46) Tarsus, Abbasid Caliphate, now Mersin Province, Turkey
Burial	Grand Mosque of Tarsus
Consorts	List Umm Isa bint Musa al-Hadi Buran bint al-Hasan ibn Sahl Sundus Arib Bi'dah Mu'nisah Tatrif Badhal Nu'n Nasim
Issue	Muhammad Ubaid Allah al-Abbas Harun Ahmad Isa Isma'il Musa Umm al-Fadl Umm Habib Khadija
Names Abū al-ʿAbbās Abd Allāh al-Maʾmūn ibn Hārūn
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-Mūnna), 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.