Al-Mustadi, Caliph (b. 1142)
Abu Muhammad Hassan ibn Yusuf al-Mustanjid (Arabic: أبو محمد حسن بن يوسف المستنجد; 1142 – 27 March 1180) usually known by his regnal title Al-Mustadi (Arabic: المستضيء بأمر الله) was the Abbasid Caliph in Baghdad from 1170 to 1180. He succeeded his father al-Mustanjid in 1170 as the Caliph.