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'Judah ben Isaac Messer Leon' (1166 – 1224) was a French tosafist born in Paris. According to Gross he was probably a descendant of Rashi, and a pupil of Isaac ben Samuel of Dampierre and his son Elhanan. He married a daughter of Abraham ben Joseph of Orleans, who has been identified by Jacobs (''Jews of Angevin England'', p. 409) with Abraham fil Rabbi Joce, chief Jew in London in 1186. In a list of that year associated with Abraham occurs the name of Leo Blund, whom Jacobs identifies with Judah ben Isaac (ib. p. 88; comp. Bacher, in ''J.Q.R.'' vi.360).
Sir Leon must have left Paris in 1182, when all Jews were expelled from the French king's dominions; he did not return till 1198. According to Gross, however, he received his chief training at Dampierre under Simson of Sens, Simson of Coucy, Solomon of Dreux, and Abraham b. Nathan of Lunel. Shortly after 1198 he returned to Paris and founded an important school of tosafists, in which were trained, among others, Jehiel ben Joseph (Sir Leon's successor), Isaac ben Moses of Vienna (author of ''Or Zarua''), Samuel ben Solomon (Sir Morel of Falaise), and Moses of Coucy.
He appears to have composed ''tosafot'' to most of the tractates of the Talmud, traces being found of his annotations to twenty tractates. The only collection that has been published are his additamenta to ''Berakot,'' published at Warsaw in 1863. A long fragment of his ''tosafot'' to ''Abodah Zarah'' is still extant in a manuscript that formerly belonged to Luzzatto and Halberstam (''R.E.J.'' vii.55) and that is now in the possession of Jews' College, London. A few of his ''responsa'' are also found, chiefly in various additions to the Mordecai, while reference is also found to his commentary on the Pentateuch, in which he appears to have followed the method of Rashbam.
Judah wrote several poems — an Aramaic description of the Decalogue (Zunz, ''Ritus'', p. 198), a ''pizmon'' (idem, ''Literaturgesch''. p. 329), and a ''piyyut'' (Landshuth, ''Ammude ha-'Abodah'', i.68). He is not, however, to be identified with the mystical Judah Ḥasid, to whom are attributed the ''Sefer ha-Ḥasidim'' and an ethical will. Among the writers whom Judah quotes may be mentioned Amram Gaon, Sherira Gaon, Hai Gaon, and Nissim Gaon, Alfasi, Maimonides, Elijah ben Menahem, Gershom ben Judah, Jacob of Orleans, Jacob of Corbeil, Joseph Karo, Joseph Bekor Shor, Yom-Tov of Joigny, and Rashi.
He died in Paris in 1224 (Solomon Luria, ''Responsa,'' No. 29).
Nota bene: This 'Judah Messer Leon' is not to be confused with another Judah Messer Leon (Judah ben Jehiel Rofe), the Italian rabbi, physician, and philosopher who flourished in Mantua, Italy in the latter half of the fifteenth century, and is the author of the well-known ''Book of the Honeycomb's Flow'' (Hebrew: נופת צופים).

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References

See also

★ Tosafists

References

★

★ Henri Gross, in Berliner's ''Magazin,'' iv.173-210;

★ idem, ''Gallia Judaica'', pp. 519-524;

★ Joseph Jacobs, ''Jews of Angevin England'', pp. 406-416.