Ritva

Rabbi Yom Tov ben Avraham Isbilli (Ritva) was a Spanish rabbi and Talmudic commentator. His commentaries to many tractates of the Talmud are a mainstay of yeshiva study to this day. Some see in the surname 'Isbili' an indication that he was born in Seville in southern Spain, but this is in doubt as his grandfather was also known by this surname. He was a leading student of Re'ah and Rashba. In addition to his Talmudic studies, he also devoted significant time and energy to the study of Rambam's Moreh Nevuchim and other philosophical works. He served as rabbi of Saragossa, where he established a beit din and yeshiva.