Pupil of Rashi; flourished at the beginning of the twelfth century. He studied under Rashi with Shemaiah (father-in-law of Rashbam), with whom he was engaged in literary work. Together they arranged the posthumous writings of their teacher, and edited, in accordance with oral instructions, a work on the Passover rite. This work is cited in the Tosafot (Pes. 114a), Rashi and Shemaiah being named as its authors.