On this day (14 September, 786 CE), ended the reign of the 4th Abbasid Caliph Musa ibn Mahdi al-Hadi due to his death. Consequently, began the reign of the 5th and arguably most prominent Abbasid Caliph, Harun al Rashid. Harun al-Rashid’s reign was marked by political stability, economic prosperity, and cultural flourishing. He expanded the …