Abu Muhammad Musa ibn Mahdi al-Hadi (born: 147 AH [764 AD]; died: 170 AH [786 AD]) was the fourth Abbasid caliph who succeeded his father Al-Mahdi and ruled from 169 AH (785 AD) until his death in 170 AH (786 AD).

The 99 names of Allah ( , Beautiful Names of Allah) are the names of God in Islam. They are described in the Quran and Sunnah, among other places.