Whakaotihia te rerenga e whai ake nei: Ko Al-Fadl ibn al-Rabi (, 757/8<unk>823/4), tetahi o nga rangatira whai mana o te Abbasid Caliphate i nga wa o Harun al-Rashid () me al-Amin (), i mahi ia hei kaitiaki me te minita nui. I whai wāhi nui a Fadl hei kaihautū matua o te
pakanga a-iwi i puta i muri i te matenga o Harun, i te taha o al-Amin ki tana tuakana, a al-Ma'mun (). Whai muri i te wikitoria a al-Ma'mun ka huna ia, engari i te mutunga ka whakataurite ia ki te rangatira hou.