Ku dhammaystiro weedhan soo socota: Fadl wuxuu bilaabay shaqadiisa xukunkii Harun al-Rashid (r. 786 <unk> 809) wuxuu ahaa adeegaha Harthama ibn A'yan, waqtigaas wuxuu ahaa madaxa ilaalada khaliijka. Awooddiisa maamul ayaa u horseeday dareenka Haaruun, oo u magacaabay xoghayaha "diwan al-kharaj" (Xafiiska Canshuuraha Dhulka). Intii lagu guda jiray
Dagaalkii sokeeye ka dib geeridii Haaruun, Fadl wuxuu ku fariistay hantidiisii Ciraaq. Halkaas ayuu ku helay Abu Ishaq, oo ahaa walaalkii Caliph al-Ma'mun (r. 813 <unk> 833) iyo Caliph al-Mu'tasim mustaqbalka, oo qiimeeyay aqoonta khubarada ee canshuuraha iyo beeraha. Sanadkii 828, Abu Isxaaq wuxuu u kaxaystay Masar, ka dibna wuxuu u magacaabay inuu madax ka noqdo "diwan al-kharaj".