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Abū al-Qāsim Aḥmad ibn al-Mustanṣir, known as Al-Musta'li, was the eighth Fatimid caliph. He ruled from 1094 to 1101, during a period of political and economic instability in the Fatimid Empire. Al-Musta'li's reign was marked by conflicts with the Seljuk Turks and internal divisions within the Fatimid court.