born 786, Baghdad died August 833, Tarsus, Cilicia in full Abu Al-'abbas 'abd Allah Al-ma'mun Ibn Ar-rashid seventh 'Abbasid caliph (813833), known for his attempts to end sectarian rivalry in Islam and to impose upon his subjects a rationalist Muslim creed.
MA'MUN, AL-
Meaning of MA'MUN, AL- in English
Britannica English vocabulary. Английский словарь Британика. 2012