Abū ʿAbd Allāh Saʿīd ibn al-Ḥasan al-Rūzbihān (d. 861) was, according to Moshe Gil, a Jewish scholar who converted to Islam around the same time as his teacher, Yūsuf ibn Mūsā ibn Rashīd al-Qaṭṭān (d. 867) of Rayy and Baghdad. Both appear in al-Khaṭīb al-Baghdādī’s Taʾrīkh Baghdād (History of Baghdad). While they are not described there as having apostatized from Judaism, Gil argues that the name Rūzbihān, the Persian equivalent of the Hebrew name Yom Ṭov, was common among Jews. This was a period during which a number of Jewish converts to Islam achieved distinction as scholars.

Marina R…