Qarmatians
Sevener Ismaili Shia group
The Qarmatians were an Isma'ili Shia militant movement led by an Arabized dynasty of Persian descent. Claiming an Alid descent, the Qarmatians were centred in al-Ahsa in Eastern Arabia, where they established a religious state in 899 CE. The Qarmatians adhered to a syncretic branch of Sevener Ismaili Shia Islam, and were ruled by a dynasty founded by Abu Sa'id al-Jannabi. They rejected the claim of the Fatimid caliph Abdallah al-Mahdi Billah to the imamate and, clinging to their belief in the coming of the Mahdi, revolted against both the Fatimid and Abbasid caliphates.
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