Mezue ahịrịokwu na-esonụ: Abu l-Abbas al-Fadl ibn Sahl ibn Zadhanfarukh al-Sarakhsi (; nwụrụ 818), nke akpọrọ Dhu 'l-Ri'āsatayn ("nwoke nke isi abụọ"), bụ onye ama ama ama ama ama ama ama ama ama ama ama ama ama nke oge Abbasid na Khurasan, onye jere ozi n'okpuru Caliph al-Ma'mun (r. 813 <unk> 832). O keere òkè dị mkpa na
agha obodo n'etiti al-Ma'mun na nwanne ya nwoke al-Amin (r. 809<unk>813), ma bụrụ onye isi nke Abbasid Caliphate ruo 817.