Harun al-Rashid · Muḥammad ibn Musa al-Khwarizmi Were Harun al-Rashid and Muḥammad ibn Musa al-Khwarizmi alive at the same time? Yes. Harun al-Rashid and Muḥammad ibn Musa al-Khwarizmi were alive at the same time, from c. AD 780 to AD 809. Harun al-Rashid5th Abbasid caliphBorn 19 February AD 766 · died 24 March AD 809, aged 43Muḥammad ibn Musa al-Khwarizmi9th-century Persian mathematician and astronomerBorn c. AD 780 · died c. AD 850 Du FuJabir ibn HayyanCharlemagneAbu NuwasHarun al-RashidMuḥammad ibn Musa al-KhwarizmiĀdi Shankara Harun al-Rashid and Muḥammad ibn Musa al-Khwarizmi in bold, with some of their best-known contemporaries. Drag across to see the age each reached in any year. Faded ends mark uncertain dates.