סעדיה אבן דנאן

Rabbi Saadiah ben Maimon ben Moshe ibn Danan was a grammarian of Hebrew and Arabic, poet and a halachic authority. He served as a dayan in Granada, and after the expulsion of Jews from Spain settled in Oran. Among his works are rabbinic Responsa, a Talmudic dictionary called Sepher Arukh, works on Hebrew grammar and Hebrew verse, as well as a Hebrew dictionary written in Arabic. He was the first writer to compare Hebrew metre with its Arabic counterpart.