Kitāb Khalq al-insān (The Nature of Man)
Sa’īd ibn Hibat Allāh, Abū al-Ḥasan was a Nestorian Christian court physician to the ’Abbāsid caliphs al-Muqtadī (ruled 467-487 AH/1075-1094 CE) and al-Mustaẓhir (ruled 487-512 AH/1094-1118 CE) and physician at the ’Aḍudī hospital in Baghdad. This treatise on the generation and development of human beings from conception to death is in fifty chapters.
The colophon states that the copy was made in Baghdad in 562 AH/1166-7 CE by by Tūmā ibn Manṣūr ibn Hibat Allāh, for his own use. It is possible that the scribe was a nephew of the author.