Abu Nasr Mansur ibn Ali ibn Iraq

Abu Nasr Mansur ibn Ali ibn Iraq was a mathematician and astronomer of Khwarazm who studied under Abu al-Wafa Muhammad ibn Muhammad al-Buzjani; he was styled "client of the Commander of the Faithful", and the editor of the Qanun identifies the caliph as al-Qadir bi-llah. ¹

Al-Biruni studied under Abu Nasr, who showed his pupil great kindness: whenever questions troubled al-Biruni he laid them before Abu Nasr, who guided him with the utmost care. ¹ One witness is his epistle to al-Biruni "in answer to questions of geometry", in which he notes that a third of the questions al-Biruni sent were already covered by Abu Sahl's book. ¹

Al-Biruni's loyalty shows in al-Athar al-baqiya, where he writes of "the derivation of my teacher Abu Nasr Mansur ibn Ali ibn Iraq". ² In the catalogue of his own works al-Biruni says that what others composed in his name are to him like foster children, and that among those who did so was Abu Nasr Mansur ibn Ali ibn Iraq. ²