Abū Jaʿfar Hārūn ibn Muḥammad ar-Rashīd, or simply Hārūn ibn al-Mahdī, famously known as The Hārūn al-Rashīd, was the fifth of the Abbasid caliphs, reigning from September 786 until his death in March 809. His reign is traditionally regarded to be the beginning of the Islamic Golden Age. His epithet al-Rashid translates to "the Just", "the Upright", or "the Rightly-Guided". February 23, 766 – March 28, 809; died at 43. Alive at the same time as Muḥammad ibn Musa al-Khwarizmi, Abu Nuwas, Ādi Shankara, Al-Shafi'i, and Charlemagne. Wiki link