Rav Yom Tov the son of Avraham Asevilli was born in Seville in 1250, and lived there until his death in 1330. He was the student of Raah and Rashba, and was the author of a major commentary on the Talmud. His commentary is extremely concise and as such is one of the most frequently referred to Talmudic works until today. Many sections of the commentary have been subject to debate regarding their actual authorship, but a large majority of the work has remained free from controversy. He was the teacher of Rav Yitzchak the son of Manor.