Many of the last-named are known as authors of general Talmudic works, as, for instance, Eliezer b. Nathan of Mainz, Judah of Corbeil, and Jacob of Coucy; but many of them are known only through their being quoted in the Tosafot, as in the case of an Eliezer of Sens, a Jacob of Orleans, and many Abrahams and Isaacs.