Al-Abbas ibn al-Ma`mun

Al-Abbas ibn al-Ma`mun (died 838 CE) was an Arab prince and general, the son of the Abbasid Caliph al-Ma`mun (r. 813–833 CE). A distinguished military leader in the Byzantine–Arab Wars, he was passed over in the succession in favour of his uncle al-Mu`tasim (r. 833–842 CE). In 838, he was arrested for his involvement in a failed conspirac......
Found on http://en.wikipedia.org/wiki/Al-Abbas_ibn_al-Ma`mun
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