ISAAC BEN JACOB HA-LAVAN OF PRAGUE
- ISAAC BEN JACOB HA-LAVAN OF PRAGUE
- ISAAC BEN JACOB HA-LAVAN OF PRAGUE (12th century),
tosafist of Bohemia. It has been maintained by some that he was called
"ha-Lavan" ("white") because of his white hair and by others that the
name is derived from the river Elbe. He was also known as Isaac of
Bohemia and Isaac of Regensburg. He was a brother of the well-known
traveler pethahiah of regensburg . Isaac lived in Germany and in
France, where he studied under isaac b. asher ha-levi , and under
jacob b. meir tam . He was the author of tosafot to
Ketubbot and Yoma which have been published on the
basis of various manuscripts – Ketubbot (1954) by P.J. Kohn;
Yoma by D. Genachowski (1956) and by P.J. Kohn (1960) in a
different reading of the manuscript. eliezer b. joel ha-levi
possessed a collection of Isaac's responsa. He is known also to have
compiled various piyyutim. The Sefer ha-Yashar of
Jacob Tam, containing sayings of Tam preserved by his pupils, also
contains traditions transmitted by Isaac (Urbach, Tosafot, p.
82 n. 27). Isaac is mentioned in the tosafot in the printed
editions of the Talmud to Yevamot, Ketubbot and
Zevaḥim, as well as in the following works of the
posekim: Yiḥusei Tanna'im ve-Amora'im, Arugat ha-Bosem,
Roke'aḥ (which includes a responsum by Isaac to
judah b. kalonymus b. moses ), the responsa of Isaac Or Zarua, and
meir b. baruch of rothenburg (which quotes a complete responsum by
him), Orḥot Ḥayyim, Kol Bo, and others. According to
Aptowitzer, Isaac died before 1188 but according to Zunz and Tykocinski,
after 1193.
-BIBLIOGRAPHY:
Zunz, Lit Poesie, 313, 489; Zunz, Gesch, index; Gross, Gal Jud, 168, no.
4; S.D. Luzzatto, in: Kerem Ḥemed, 7 (1843), 69; V.
Aptowitzer, Mavo le-Sefer Ravyah (1938), 174, 260, 296,
375f.; G. Scholem, in: Tarbiz, 3 (1931/32), 276f.;
Tykocinski, in: Germ Jud, 1 (1934), 275f.; and index
S.V.; Urbach, Tosafot, index S.V.; D.
Ganchowsky, in: Sinai, 38 (1956), 288–311; idem (ed.),
Tosefot R. Yiẓḥak ben Ya'akov ha-Lavan le-Massekhet Yoma
(1956), introduction.
(Shlomoh Zalman Havlin)
Encyclopedia Judaica.
1971.
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