His name sustains the possibility that he was a descendant of the Banu Qasi, that had once staged a rebellion against the Emirate of Cordoba.
Even before his political uprising, he was known by the state-jurist establishment for sowering corruption, possessing the minds of the ignorant, claiming sainthood, the titles of Imām, and Mahdī all in effort against the state.
Ibn al-Qaṣī is most known for his treatise Discarding the Two Shoes and Borrowing Light from the Site of the Two Feet (Khalʿ al-naʿlayn wa iʾtibās al-nūr min mawḍiʿ al-qadamayn), which is influenced by Masarrian thought, amongst other undercurrents in Andalusia.
Shaykh al-Akbar became familiar with this text, when he met Ibn al-Qaṣīʾs son in Tunis 1194.
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