Wikipedia
Ushrusaniyya
The Ushrusaniyya ( ) were a regiment in the regular army of the Abbasid Caliphate. Formed in the early ninth century A.D., the unit consisted of soldiers who were originally from the region of Ushrusana in Transoxiana. The Ushrusaniyya initially served under the prominent general al-Afshin, but they remained active after his downfall, and are frequently mentioned during the period known as the Anarchy at Samarra.