Who was the author of Kitab Ul khiraj imam abu yusuf , mentioned by sultan Tugrul in Bolum 37 ???? Imam abu yusuf ,was a student of jurist imam azam Abu Hanifa , He served as the chief judge (qadi al-qudat) during reign of Harun al-Rashid. His most famous work was Kitab al-Kharaj, a treatise …