Abu'l-Qasim Ahmad al-Mustansir (Arabic: أبو القاسم أحمد المستنصر; c. 1190 – 28 November 1261) was the first Abbasid caliph to rule in Cairo and who was subservient to the Mamluk Sultanate. He reigned from June 1261 to 28 November 1261.
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