| al-Mansur Billah المنصور بالله | |||||
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 Gold dinar of al-Mansur, minted at his new capital, al-Mansuriya, in 949/50 | |||||
| Imam–Caliph of the Fatimid Caliphate | |||||
| Reign | 17 May 946 – 18 March 953 | ||||
| Predecessor | al-Qa'im bi-Amr Allah | ||||
| Successor | al-Mu'izz li-Din Allah | ||||
| Born | January 914 Raqqada, Fatimid caliphate | ||||
| Died | 18 March 953 (aged 39) | ||||
| Issue | al-Mu'izz li-Din Allah | ||||
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| Dynasty | Fatimid | ||||
| Father | al-Qa'im bi-Amr Allah | ||||
| Mother | Karima | ||||
| Religion | Isma'ili Shia Islam | ||||
| Part of a series on Islam Isma'ilism |
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Abu Tahir Isma'il (Arabic: أبو طاهر إسماعيل, romanized: Abū Ṭāhir ʾIsmāʿīl; January 914 – 18 March 953), better known by his regnal name al-Mansur Billah (Arabic: المنصور بالله, romanized: al-Manṣūr biʾllāh, lit. 'The Victor through God'), was the third caliph of the Fatimid Caliphate in Ifriqiya, ruling from 946 until his death. He presided over a period of crisis, having to confront the large-scale Kharijite rebellion of Abu Yazid. He succeeded in suppressing the revolt and restoring the stability of the Fatimid regime.