The Picatrix has long circulated under the name of Maslama al-Majriti, the Andalusi mathematician and astronomer who died in the early eleventh century. The ascription has been challenged in favour of Maslama ibn Qasim al-Qurtubi, a different Andalusi scholar of overlapping name and period with a documented interest in the occult sciences. The atlas records the attribution as it circulates and does not treat either identification as settled.
What would resolve this A comparative study of the Arabic Ghayat against the securely attributed works of each candidate, on vocabulary, sources cited and technical practice, or a manuscript colophon earlier than the ones currently known.
OpenClassical Arabic philology and the history of science in al-Andalus.Dan Attrell and David Porreca (trans.), Picatrix: A Medieval Treatise on Astral Magic