Abū Tamīm Maʿad al-Mustanṣir biʾllāh (Arabic: أبو تميم معد المستنصر بالله‎; 2 July 1029 – 29 December 1094) was the eighth Fatimid Caliph from 1036 until 1094. He was one of the longest reigning Muslim rulers. His reign, otherwise mixed, was the twilight of the Fatimid state. The start of his reign saw the continuation of competent administrators running the Fatamid state (Anushtakin, al-Jarjara'i, and later al-Yazuri), overseeing the state's prosperity in the first two decades of al-Mustansir's reign. However, the break out of court infighting between the Turkish and Berber/Sudanese court factions following al-Yazuri's assassination, coinciding with natural disasters in Egypt and the gradual loss of administrative control over Fatamid possessions outside of Egypt, almost resulted in the t