Nyorai kuenderera mberi kweiyi ndima - Abu l-Abbas al-Fadl ibn Sahl ibn Zadhanfarukh al-Sarakhsi (akafa 818), anonzi Dhu 'l-Ri'āsatayn ("murume wemisoro miviri"), aive mukurumbira wePersian wezera reAbbasid muKhurasan, uyo akashanda pasi paCaliph al-Ma'mun (r. 813 <unk> 832). Akaita basa rinokosha muhondo yevagari vemo
pakati al-Ma'mun uye munun'una wake al-Amin (r. 809<unk>813), uye aiva mutevedzeri waAbbasid Caliphate kusvika muna 817.