What is "al-ma'mun"

Abū Jaʿfar Abdullāh al-Ma'mūn ibn Hārūn al-Rashīd (; September 786 – 9 August 833) was the seventh Abbasid caliph, who reigned from 813 until his death in 833. He succeeded his brother al-Amin after a civil war, and presided over the greatest cultural and scientific flowering of Baghdad, but also over the Mu'tazilism controversy, and the resumption of large-scale warfare with the Byzantine Empire.

Al-Ma'mun may refer to:

• al-Ma'mun (786–833), a 9th-century Abbasid Caliph
• Ma'mun I ibn Muhammad (died 997), Khwarazmshah
• Ma'mun II (died 1017), Khwarazmshah
• al-Ma'mun al-Bata'ihi (died 1125), vizier to the Fatimid caliph al-Amir bi-Ahkami'l-Lah.
• al-Mamun of Toledo (died 1075), Taifa king and a member of the Banu Dil-Nun dynasty.
• Idris al-Ma'mun (died 1232), claimant to the Almohad caliphate