Harun al-Rashid receiving a delegation sent by Charlemagne at his court. 5th Caliph of the Abbasid Caliphate; Reign: 14 September 786 – 24 March 809 https://en.wikipedia.org/wiki/Harun_al-Rashid
The fifth Abbasid caliph, Harun al-Rashid and his fabulous court at Baghdad are immortalized in The Thousand and One Nights. http://historymedren.about.com/od/hwho/p/Harun-al-Rashid.htm
