Al-Mustansir Billah
المستنصر بالله
al-Mustanṣir bi-llāh
🏛️Historical
Eighth Fatimid caliph-imam with the longest reign in Islamic history.
Full Definition
Al-Mustansir Billah (1029-1094 CE) was the eighth Fatimid caliph-imam who ruled for 60 years, the longest reign in Islamic history. His succession led to a division in the Ismaili community between followers of his sons Nizar and al-Mustaʿli. Despite political challenges during his reign, he maintained the Fatimid state and continued its intellectual traditions.