The Talmud is a collection of Jewish law and teachings. The core of the Talmud is the Mishnah, a compilation of laws and rulings collated by Rabbi Judah the Prince about 200 A.D. The Gemara is a commentary on the Mishnah produced by scholar-teachers known as amoraim in the years 200–500 A.D. The Mishnah and the Gemara together compose the Talmud (although sometimes the Gemara alone is referred to as Talmud).