Nathan P. Gibson, Vanessa Birkhahn and Hanna Friedel, (eds.), "ʿUmar ibn al-Khaṭṭāb — عمر بن الخطاب " 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/2261
   
      
         
            
               ʿUmar ibn al-Khaṭṭāb
               عمر بن الخطاب
               ʿUmar ibn al-Khaṭṭāb, second caliph (reg. 13–23/634–644) after Muḥammad’s death
               https://usaybia.net/person/2261
               
                  caliph
               
               
                  Muslim
               
               
                  A literary history of medicine: the 'Uyūn al-anbā' fī ṭabaqāt al-aṭibbā' of Ibn Abī Uṣaybi'ah
                  
                  7.1.5