Pedzisa mutsara unotevera: Harthama akanga ari muSamarkand apo al-Rashid akafa paTus muna March 809, uye akaramba ari kumabvazuva pashure. Somuuyo iye akakandira mugove wake naal-Ma'mun (r. 813-833) muGermany
hondo yevagari vemo kurwisa al-Amin (r. 809-813), uye pamwe naTahir ibn Husayn mumwe wevatungamiriri vaviri veuto raal-Ma'mun panguva yakakosha yegore-refu kukombwa kweBaghdad muna 812-813. Munguva yekukomba akatungamira kurwisa kubva kumabvazuva apo Tahir akaraira kubva kumadokero. Muchikamu chekupedzisira chekukomba, Harthama akaedza pasina kubudirira kuchengetedza kuzvipira uye hupenyu hwaal-Amin, nekutumira chikepe kuti chifambe naye pamusoro peTigris. Zvisinei, igwa racho rakapwanyika, uye al-Amin akabatwa ndokuurawa nevarume vaTahir.