Abu'l-Saj belonged to Sogdian family from Jankakath and Suydak, which were two villages that were very close to each other, and were the dependencies of Ushrusana. He entered into the service of the Abbasids and fought under the Afshin during the latter's final campaign against the rebel Babak Khorramdin in 837 AD.
Abu'l-Saj was part of a Sogdian family from Jankakath and Suydak, two nearby villages that were under Ushrusana's jurisdiction. He joined the Abbasid army and participated in Afshin's campaign against rebel Babak Khorramdin in 837 AD.