Judah ben Nathan, also referred to by the Hebrew acronymRiVaN, was a gifted Frenchrabbi and commentator on theTalmud in the eleventh to twelfth century, best known for being the son-in-law and pupil of the great commentatorRashi, and to a great extent his continuator.

It was Judah who completed Rashi's commentary on tractateMakkot of the Talmud (from 19b to the end),^[1] and who wrote the commentary onNazir which is erroneously attributed to Rashi. He is also known to have written independent commentaries onEruvin,Shabbat,Yevamot,^[2] andPesahim.^[3] Finally, Halberstam manuscript No. 323 contains a fragment of Judah's commentary onNedarim.

He also contributed some of the firsttosafot (additions) to Rashi's Talmud commentary, pulling out certain points in greater detail. It is generally considered that Judah b. Nathan wrote tosafot to several treatises of the Talmud, and he is mentioned as a tosafist inHaggahot Mordekhai (Sanhedrin, No. 696). He is often quoted in the edited tosafot.

Judah married Rashi's second daughter Miriam, and they had several children. Their sonYom Tov later moved to Paris and headed ayeshiva there, along with his brothers Shimson and Eliezer;^[4] their daughter, Alvina, was a learned woman whose customs served as the basis for later halakhic decisions.

 This article incorporates text from a publication now in thepublic domain: Joseph Jacobs andM. Seligsohn (1901–1906)."Tosafot". InSinger, Isidore; et al. (eds.).The Jewish Encyclopedia. New York: Funk & Wagnalls.

• 11th-century French rabbis
• 12th-century French rabbis
• French Tosafists
• 11th-century French writers
• 12th-century French writers

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