Abu al-Muẓaffar Yusuf ibn Muhammad al-Muqtafi (; 1124 – 20 December 1170) better known by his regnal name al-Mustanjid bi-llah () was the Abbasid caliph in Baghdad from 1160 to 1170. He was the son of previous Caliph al-Muqtafi.
Biography
Al-Mustanjid was born in 1124. He was the son of caliph al-Muqtafi and his mother was an Umm walad named Thawus. His full name was Yusuf ibn Muhammad al-Muqtafi and his Kunya was Abu al-Muzaffar. When Yusuf was a young prince his father became Caliph in 1136. His father ruled for almost twenty-four years until his death in 1160. When his father died, he ascended to the throne. He continued the policies of his father and he also confirmed Awn al-Din ibn Hubayra as his vizier. Awn al-Din had previously served as the vizier to his father. Awn al-Din's Tenure marked the final decline of the Seljuq influence in the Abbasid court (cf. Abbasid–Seljuk war), and saw a flowering of Hanbali learning in Baghdad. Ibn Hubayra was also involved in the conquest of Fatimid Egypt by Nur ad-Din Zangi.