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In page Aghlabid dynasty:

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The decline of the dynasty began under Ibrahim II (875–902). An attack by the Tulunids of Egypt had to be repelled and a revolt of the Berbers put down with much loss of life.[citation needed] In 893 there began amongst the Kutama Berbers the movement of the Isma'ili Fatimids, led by Abu Abdallah al-Shi'i, the dā'ī of the future caliph Abdallah al-Mahdi, although it took almost a decade before they were able to seriously threaten Aghlabid power.[1]