Abu Yusuf
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Yaqub ibn Ibrahim al-Ansari, better known as Abu Yusuf (Arabic:أبو يوسف) (d.798) was a student of legist Abu Hanifah (d.767) who helped spread the influence of the Hanafi school of Islamic law through his writings and the government positions he held.
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He was appointed Qadi (judge) in Baghdad, Iraq, and later chief justice (qadi al-qudat) under Abbasid caliph Harun al-Rashid (r.786-809) with authority to appoint judges in the empire. Some of his opinions differ from those of Abu Hanifah, probably on the basis of traditions not available to the earlier scholar.
His most famous work is Kitab al-kharaj[1]
- Kitab al-kharaj is a treatise on taxation and fiscal problems of the state prepared for the caliph. [1]
- usul al-fiqh - the earliest known work of principles of Islamic jurisprudence. A portion of his works were devoted to international law.[1]
- Kitab al-Athar, a collection of traditions (ahadith) he narrated
- Kitab Ikhtilaf Abi Hanifa wa Ibn Abi Layla, one of the early works on comparative Fiqh
- Kitab al-Radd ‘Ala Siyar al-Awza’i, a refutation of the famous Syrian jurist and tradition, al-Awza’i on the law of war.
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