Judah Ḥayyūj
Judah Ḥayyūj ben David al-Fāsī, also known as Abū Zakariyyā Yaḥyā, was a prominent Andalusi grammarian and linguist. Born in Fez, Ḥayyūj moved to Córdoba under the influence of the courtier Ḥasday Ibn Shaprūṭ. Andalusi philologists of the eleventh and twelfth centuries held Ḥayyūj in high esteem, crediting him with discovering and proving that all Hebrew verb roots contain (at least) three letters. Ḥayyūj was apparently the first Andalusi Jew known to write in Arabic. His Book of Small Pearls (Kitāb al-nutaf) employs the methodology of Arabic grammarians. Ḥayyūj seems to have been a student of the grammarian Menaḥem Ibn Sarūq and was involved in the controversy between Menaḥem and Dunash ben Labraṭ.