Abū al-Faḍl al-ʿAbbās ibn al-Mutawakkil, better known by his regnal name al-Mustaʿīn bi-'llāh was the 10th Abbasid caliph of Cairo under the Mamluk sultanate from 1406 to 1414. He was the only Cairo-based caliph to hold political power as Sultan of Egypt, albeit for only six months in 1412. All the other Cairene caliphs were spiritual figureheads lacking any temporal power.
- Occupation
- politician, ruler, governor
- Position held
- Sultan of Egypt, Abbasid caliph
- Born
- 1390, 1393
- Died
- 1430
