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Yaqub ibn Ibrahim al-Ansari, better known as Abu Yusuf ((アラビア語:أبو يوسف)) (d.798) was a student of jurist 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. 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 on taxation and fiscal problems of the state. ==Biography== Abu Yusuf lived in Kufa and Baghdad, in what is now Iraq, during the 8th century. His genealogy has been traced back to Sa'd b. Habta, a youth in Medina in the time of the Prophet, and his birth date is estimated based on his the date of his death to be around 113/729CE.〔Schacht, J. "Abū YūsufYa'kūb b. Ibrāhīm al-Ansārī al-Kūfī" Encyclopaedia of Islam, Second Edition. Edited by: P. Bearman; , Th. Bianquis; , C.E. Bosworth; , E. van Donzel; and W.P. Heinrichs. Brill, 2011. Brill Online. Yale University. 11 February 2011〕 Based on anecdotal stories, Abu Yusuf was raised poor but with a ferocious appetite for knowledge. His mother disapproved of his academic desires, insisting that he master some trade(the art of tailoring, according to some source) so as to help make ends meet. While it cannot be fully verified, stories suggest that he complied with his mother's wishes, but also kept up his academic studies.〔Imam Abu Yusuf (rahmatullahi alaihi). 2003. 14 February 2011 <()>.〕 His talent and commitment was eventually recognized by Abu Hanifa who became his mentor with Abu Yusuf as his star pupil. He is portrayed as an incredibly studious individual who was unceasing in his pursuit for knowledge and legal understanding.〔 While much of what is known of his early childhood relies on sometimes contradictory anecdotal evidence, it has been verified that he studied religious law and traditions in Kufa and Medina under a number of scholars including Abu Hanifa, Malik b. Anas, al-Layth b. Sa'd and others.〔 Under the guidance of Abu Hanifa, Abu Yusuf achieved incredible success and helped develop and spread the influence of the Hanafi school of Islamic law. Abu Yusuf lived in Kufa until he was appointed Qadi in Baghdad.〔 It is unclear whether he was appointed by Mahdi, al-Hadi, or Harun al-Rashid. According to one story, Abu Yusuf was able to provide sound advice pertaining to religious law to a government official who rewarded him generously and recommended him to the caliph, Harun al-Rashid.〔 He continued to provide satisfactory legal opinions to the caliph who drew him into his inner circle and eventually appointed him Qadi. While this version of events is probable, it is not necessarily authentic and cannot be independently verified. What is known is that Abu Yusuf became a close acquaintance of Abbasid caliph, Harun al-Rashid, who eventually granted him the title of Grand Qadi, or Qadi 'l-qudat; the first time such a title had been conferred upon someone in Islamic history.〔 While at the time it was meant as an honorific title, the Caliph frequently consulted Abu Yusuf on legal matters and financial policy and even bestowed upon him the ability to appoint other Qadis in the empire. This made the position of Grand Qadi analogous to a modern-day chief justice. Abu Yusuf held the position of Grand Qadi until his death in 182/798CE.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Abu Yusuf」の詳細全文を読む スポンサード リンク
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