Wikipedia
Ar-Radi
Abu 'l-Abbas Muhammad ibn Ja'far al-Muqtadir (907 – 23 December 940), usually simply known by his regnal name al-Radi bi-llah (, "Content with God"), was the 23rd Abbasid Caliph, reigning (rather than ruling) in Baghdad from 934 to his death at the age of thirty-three in 940.