al-Musta'li bi'llah, Caliph (fatimids) : All Data
al-Musta'li bi'llah was the Caliph of the Fatimid Caliphate, reigning from 1094 to 1101. During his rule, the most significant war was the First Crusade, which took place from 1096 to 1099. This war saw the Crusaders capture Jerusalem in 1099, marking a major turning point in the conflict between the Christian and Muslim forces in the region. Although al-Musta'li bi'llah's reign extended beyond the end of the First Crusade, this war was the most notable and impactful during his tenure as Caliph.
