Al-Hasan al-Hajjam ibn Muhammad ibn al-Qasim

Al-Qasim descended from a cadet branch of the Idrisid dynasty: his grandfather, al-Qasim, was a younger son of the dynasty's second ruler, Idris II.^[2] In 922 or 925 or 928 (medieval and modern sources provide different dates) he rose in revolt against the Fatimid Caliphate's viceroy in Morocco, Musa ibn Abi'l-Afiya, and recovered control of Fes.^[1][3] Two years later, he defeated Ibn Abi'l-Afiya in combat, but was betrayed by Hamid ibn Hamdan, the governor he appointed over Fes, and imprisoned, while Fes was surrendered to Musa.^[1][3]

Ibn Abi'l-Afiya then fell out with Hamid ibn Hamdan and the Fatimids, launching a persecution of the Idrisids, before siding with the Fatimids' enemies, the Umayyad Caliphate of Córdoba in 931.^[3] A complicated struggle followed between the Hamid ibn Hamdun, the Idrisids, their rivals from the Abu Sahl family, Musa ibn Abi'l-Afiya, and the Fatimids under the general Maysur.^[2] Allied with the Fatimids against Ibn Abi'l-Afiya, Hasan's brother al-Qasim Jannun managed to establish an Idrisid emirate in the Rif Mountains in northern Morocco,^[1] before switching his allegiance to the Umayyads in 944.^[2]

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