Abu Yusuf Ya'qub
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Abu Yusuf Ya'qub ibn Ibrahim al-Ansari al-Kufi (731–798) was a famous Muslim jurist and one of the founders of the Hanafi school of Islamic jurisprudence. He served as a chief religious judge (qadi) under the Abbasid caliph Harun al-Rashid. Abu Yusuf wrote Kitab al-Kharaj (Book on Taxation), which is a basic treatise on the issues of public finance in Islamic law.