Abū Isḥāq Muḥammad ibn Hārūn ibn Muḥammad ibn Hārūn al-Muhtadī bi-ʾLlāh, better known by his regnal name al-Muhtadī bi-ʾLlāh, was the Caliph of the Abbasid Caliphate from July 869 to June 870, during the "Anarchy at Samarra".
- Occupation
- politician, caliph
- Position held
- Abbasid caliph
- Born
- 825
- Died
- June 19, 870
