Nathan P. Gibson, Vanessa Birkhahn and Hanna Friedel, (eds.), "Abū Bakr — أبو بكر " 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/119 Abū Bakr أبو بكر Abū Bakr, the first caliph after Muḥammad’s death https://usaybia.net/person/119 caliph Muslim A literary history of medicine: the 'Uyūn al-anbā' fī ṭabaqāt al-aṭibbā' of Ibn Abī Uṣaybi'ah 7.1.5