Rubuta ci gaba don wannan sakin layi - Bayan mutuwar Harun a 809, magajinsa al-Amin ya fara amfani da al-Abbas don yin aiki a matsayin manzo ga al-Ma'mun a Khurasan, amma a tsakiyar rikicin da ke ƙaruwa
tsakanin 'yan'uwa biyu da sauri ya shawo kan canza bangarori kuma ya ba da amincinsa ga al-Ma'mun maimakon. A watan Maris na 812 ya shiga cikin juyin mulkin da ya gaza na al-Husayn ibn Ali ibn Isa, wanda a ciki ya kasance yana da alhakin kama al-Amin da mahaifiyarsa Zubaydah bint Ja'far, kuma daga baya aka zaɓe shi ya jagoranci aikin hajji na farko da aka yi a cikin sunan al-Ma'mun, a cikin 812, 813 da 814.