Al-Hadi, Iranian caliph (d. 786)
Abu Muhammad Musa ibn al-Mahdi al-Hadi (Arabic: أبو محمد موسى بن المهدي الهادي; 26 April 764 CE – 14 September 786 CE) better known by his laqab Al-Hadi (الهادي‎) was the fourth Arab Abbasid caliph who succeeded his father Al-Mahdi and ruled from 169 AH (785 CE) until his death in 170 AH (786 CE). His short reign ended with internal chaos and power struggles with his mother.