ר׳ יונה אבן ג׳נאח

ר׳ יונה אבן ג׳נאח, known in Arabic as Abū al-Walīd Marwān ibn Janāḥ and in some Hebrew sources as ר׳ מרינוס, was the most comprehensive Hebrew grammarian and biblical lexicographer of eleventh-century al-Andalus, as well as a practicing physician. His precise birth details are unknown: scholarly reference works place him around 985–995 and allow either Córdoba or nearby Lucena. He was educated at Lucena, where he studied poetry and biblical language with ר׳ יצחק בן לוי אבן מר שאול and Arabic language and literature with ר׳ יצחק אבן ג׳יקטילה. He attempted Hebrew poetry in youth but later judged poetry outside his true vocation. In Córdoba he studied medicine and immersed himself in the grammatical writings of ר׳ יהודה בן דוד חיוג׳. Although often described as ר׳ יהודה חיוג׳'s disciple, the evidence indicates intellectual discipleship through books rather than a documented personal meeting. His earliest grammatical work, כתאב אלמסתלחק, systematically supplemented and corrected ר׳ יהודה חיוג׳'s accounts of weak and doubled roots. The Berber siege and violence of 1012 forced him to leave Córdoba; after a period of wandering in the Upper March, he settled permanently in Zaragoza, supported himself through medicine and gathered younger students interested in language. His critiques provoked sustained written controversy, especially with the circle of ר׳ שמואל הנגיד, but the disputes also drove him to clarify his method in several shorter treatises. His culminating כתאב אלתנקיח (Book of Exact Investigation) united two complementary works: כתאב אללמע, translated as ספר הרקמה, a systematic grammar of biblical Hebrew; and כתאב אלאצול, translated as ספר השרשים, an extensive dictionary organized by roots. He applied the triliteral-root system with greater completeness than his predecessors, analyzed morphology, syntax, ellipsis, word order, gender, number and exceptional constructions, and used comparative evidence from Arabic and Aramaic while remaining closely attentive to the Masoretic biblical text. His dictionary drew on Scripture, the Targumim, Mishnah, Talmud, Midrash and cognate Semitic languages to explain difficult vocabulary. He did not write a continuous biblical commentary, yet the grammatical and lexical works contain a vast dispersed commentary whose commitment to linguistic context became foundational for medieval peshat exegesis. A lost medical compendium, כתאב אלתלכיץ, is attributed to him by the Arabic biographer of physicians Ibn Abī Uṣaybiʿa. ר׳ יהודה בן שאול אבן תיבון later translated the two parts of כתאב אלתנקיח into Hebrew, completing ספר השרשים in 1171. Through those translations, ר׳ אברהם אבן עזרא, ר׳ דוד קמחי and generations of biblical commentators transmitted, debated and popularized his philology. His works represent the mature synthesis of Andalusian Hebrew linguistic science, Arabic grammatical method and close Jewish textual scholarship.