At-Tayyib Abi l-Qasim

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According to Ṭayyibī Musta‘lid Isma‘ili Muslims, aṭ-Ṭayyib Abī l-Qāṣim ((lang-ar|الطيب أبي القاسم)) was the 21st and last Fatimid Imām, the hereditary leader of the Muslim community in the direct line of ‘Ali). Abī l-Qāṣim was the son of the 20th Fatimid Imām, Mansur al-Amir Bi-Ahkamillah, ruler of Egypt from 1101-1130. He was born in Al-Qaheratul Moizziyyah on Sunday the 4th of Rabiul Aakher, 524H.

According to Ṭayyibī Musta‘lid tradition, before Ṭayyib went into the Occultation, his father al-Amir had instructed Queen al-Hurrah in Yemen to anoint a vicegerent after the seclusion, the Da'i al-Mutlaq, who as the Imam's vicegerent has full authority to govern the community in all matters both spiritual and temporal.

Hafizi Musta‘li Isma‘ilis were those who continued to accept the legitimacy of the Fatimid rulers of Egypt between 1130-1169 instead of aṭ-Ṭayyib Abī l-Qāṣim.