Fayyūmī,  Natanaʾel, a Jewish theologian of the Fāṭimid period who was heavily influenced by Ismaili cosmology. Fayyūmī was also the author of Bustān al-ʿuqūl, a 12th-century treatise written in Judeo-Arabic (i.e. Arabic written in Hebrew characters with an admixture of Hebrew words and phrases), and his name appears in the colophon of the unicum manuscript of this work (ʿanā bi taʾlīfhā Rav Natanaʾīl BīravFayyūmī). Qāfiḥ points out that his nisba, Fayyūmī and not al-Fayyūmī, is that of his family and does not indicate an origin in the town of Fayyūm in Egypt (Qāfiḥ, 11).

Al-Fayyūmī live…