al-Mustain
Al-Mustain / Al-Musta'in is the throne name of several Islamic rulers:
- al-Musta'in bi-llah , Abbasid Caliph in Baghdad (862–866)
- Al-Musta'in I (Saragossa) († 1047), Taifa of Saragossa
- Sulaiman al-Mustain , Caliph of Córdoba in Andalusia (1009-1010 and 1013-1016)
- al-Mustain (Egypt) , Abbasid Caliph in Cairo and Sultan of the Mamelukes (1412)
