Abu Hatim, Ahmad ibn Hamdan al-Razi (Persian: ابو حاتم احمد بن حمدان الرازی) was a PersianIsmaili philosopher of the 9th century, who died in 322 AH. He was also the chief dai' (missionary) of Rayy and the leader of the Ismaili da'wah in Central Persia.
^Abi Bakr Mohammadi Filii Zachariæ (Razis): Opera philosophica fragmentaque quae supersunt collegit et edidit PAULUS KRAUS. Pars prior. (Universitatis Fouadi I Litterarum Facultatis Publicationum fasc. XXII). Cairo, 1939. p. 291. Editor mentions that this date is mentioned only in كتاب لسان الميزان
^Henry Corbin, "The voyage and the messenger: Iran and philosophy", North Atlantic Books, 1998. pg 74: "Virtually all its greatest exponents covering the period from the ninth to the eleventh century C.E. show obvious Iranian affiliation. Examples are Abu Hatim Razi)"