Al-Adid, last Fatimid caliph (born 1151)

Abū Muḥammad ʿAbd Allāh ibn Yūsuf ibn al-Ḥāfiẓ, better known by his regnal name al-ʿĀḍid li-Dīn Allāh, was the fourteenth and last caliph of the Fatimid dynasty, and the twenty-fourth imam of the Hafizi Isma'ili branch of Shi'a Islam, reigning from 1160 to 1171.

September 13 is the 256th day of the year in the Gregorian calendar; 109 days remain until the end of the year.