Pedzisa mutsara unotevera: Yahya akanga ari mwanakomana wePersian "mawla" Mu'adh ibn Muslim, nhengo yakakurumbira ye "Khurasaniyya", uyo akashanda maAbbasids okutanga gavhuna uye mukuru. Muna 806, Caliph Harun al-Rashid akatuma Yahya kuSyria kunodzvinyirira mutungamiriri wemakororo Abu al-Nida. Yahya akapedza basa iri, uye akashanda samutongi weSiria yose kwegore. Akabva aperekedza Aroni parwendo rwake kuenda kuKhurasani kunotarisana nokupandukira kwaRafi ibn al-Layth, uye mushure mekufa kwaHaruni muna 809 akaramba ari muKhurasani nemwanakomana wechipiri waHaruni, al-Ma'mun. Apo
hondo yevagari vemo naal-Amin yakatanga, akapihwa chinzvimbo chevaziri kuna al-Ma'mun asi akaramba - chinzvimbo chakaenda kuna al-Fadl ibn Sahl - uye akaramba asina kubatanidzwa mukukakavadzana. Mushure mekupera kwehondo yevagari vemo akashanda semubati weJazira neArmenia, uye akatora munda kurwisa maKhurramites eBabak Khorramdin. Akafa muna 821/822.