Abū'l-Qāsim al-Ṭayyib أبو القاسم الطيب | |
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| Born | February/March 1130 Cairo |
| Title | Imam of Tayyibi Isma'ili Shia Islam |
| Term | 7 October 1130 – unknown |
| Predecessor | al-Amir bi-Ahkam Allah |
| Successor | unknown |
| Movement | Tayyibi Musta'li Isma'ili Shia Islam |
| Parent | al-Amir bi-Ahkam Allah (father) |
| Part of a series on Islam Isma'ilism |
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Abūʾl-Qāsim al-Ṭayyib ibn al-Āmir (أبو القاسم الطيب بن الآمر) was, according to the Tayyibi sect of Isma'ilism, the twenty-first imam. The only son of Caliph al-Amir bi-Ahkam Allah, al-Tayyib was an infant when his father was murdered. Amidst the ensuing power struggle, al-Tayyib disappeared; modern historians suggest that he died or was secretly killed by one of the rival strongmen. By 1132, his uncle al-Hafiz declared himself as the caliph and imam in succession to al-Amir. This was not accepted by the Yemeni Isma'ilis, who upheld the rights of al-Tayyib.
This marked the creation of two rival sects of Musta'li Isma'ilism, the Hafizi one, following al-Hafiz, and the Tayyibi one, following al-Tayyib. The Tayyibis hold that al-Tayyib was rescued from Cairo and brought to safety, but that he and all subsequent Tayyibi imams remained in concealment. The Tayyibi community has instead been led by a sequence of 'absolute missionaries' (da'i al-mutlaq).