Nathan P. Gibson, Vanessa Birkhahn and Hanna Friedel, (eds.), "al-Kayyāl — الكيال " in Communities of Knowledge: Interreligious Networks of Scholars in Ibn Abi Usaybiʿa’s History of the Physicians last modified June 23, 2021, https://usaybia.net/person/1373
   
      
         
            
               al-Kayyāl
               الكيال
               al-Kayyāl, Aḥmad ibn Zakariyyā (active 3rd/9th c.), Ismaili missionary
               https://usaybia.net/person/1373
               
                  missionary
               
               
                  A literary history of medicine: the 'Uyūn al-anbā' fī ṭabaqāt al-aṭibbā' of Ibn Abī Uṣaybi'ah
                  
                  11.5.25 .no. 136