Abu Yusuf Ya'qub ibn Ibrahim al-Ansari (jan 1, 729 – dec 31, 798)
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A leading Islamic jurist and student of Abu Hanifa. He became the chief judge (qadi al-qudat) under the Abbasid Caliph Harun al-Rashid and wrote Kitab al-Kharaj, a treatise on taxation and economic matters.
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