Dictionary
Ma'•mun, al-
Pronunciation: (al'mä-mOOn', -ma-), [key] (abu-al-'Abbās 'Abdullāh) a.d.786–833, caliph of Baghdad 813–833 (son of Harun al-Rashid).
Also,al-Mamoun.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.