Бану Каси
His actual existence has been contested on the grounds that embellishing stories related to Gothic ancestry were rather popular during the Caliphate of Cordoba. The name is anachronistic, and no Banu Qasi is attested until Mutarrif ibn Musa during the 780s, but he is identified with just his father's name and not explicitly linked to Cassius or the Banu Qasi. Historians point out that the origins of the Banu Qasi, as recounted by Ibn al-Qutiyya, could be a product of the spurious antiquarianism of the later Umayyad period rather than reliable genealogy, satisfying the need for stories which bridged the conquest.