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According to ṬayyibīMusta‘lidIsma‘ili, Taiyab abi al-Qasim ((lang-ar|الطيب أبي القاسم)) was the 21st and (as some believe) the last FatimidImām, the hereditary leader of their community said to be 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-Moizziyyatul Qaherah on Sunday the 4th of Rabiul Aakher, 524H.
According to Ṭayyibī Musta‘lid tradition, before Tayyeb went into seclusion, his father Al-Amir had instructed Queen al-Hurrah Arwa al-Sulayhi 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.She appointed Dai Zoeb bin musa as First Dai .
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The Uyun al-akhbar is the most complete text written by an Ismaili/Tayyibi/Dawoodi 19th Dai Sayyedna Idris bin Hasan on the history of the Ismaili community from its origins up to the 12th century CE. period of the Fatimid caliphs al-Mustansir (d. 487/1094), the time of Musta‘lian rulers including al-Musta‘li (d. 495/1101) and al-Amir (d. 524/1130), and then the Tayyibi Ismaili community in Yemen...