Rabbi Isaac ben Mordecai of Regensburg (

Hebrew Hebrew (; ; ) is a Northwest Semitic language of the Afroasiatic language family. Historically, it is one of the spoken languages of the Israelites and their longest-surviving descendants, the Jews and Samaritans. It was largely preserved ...

: יצחק בן מרדכי מרגנסבורג) also known by his acronym Ribam (Rabbi Isaac Ben Mordecai) was a 12th century

German German(s) may refer to: * Germany (of or related to) **Germania (historical use) * Germans, citizens of Germany, people of German ancestry, or native speakers of the German language ** For citizens of Germany, see also German nationality law **Ger ...

Tosafist The Tosafot, Tosafos or Tosfot ( he, תוספות) are medieval commentaries on the Talmud. They take the form of critical and explanatory glosses, printed, in almost all Talmud editions, on the outer margin and opposite Rashi's notes. The auth ...

Biography

Born in

Prague Prague ( ; cs, Praha ; german: Prag, ; la, Praga) is the capital and largest city in the Czech Republic, and the historical capital of Bohemia. On the Vltava river, Prague is home to about 1.3 million people. The city has a temperate ...

Bohemia Bohemia ( ; cs, Čechy ; ; hsb, Čěska; szl, Czechy) is the westernmost and largest historical region of the Czech Republic. Bohemia can also refer to a wider area consisting of the historical Lands of the Bohemian Crown ruled by the Bohem ...

, in his early years, Rabbi Isaac studied in

Regensburg Regensburg or is a city in eastern Bavaria, at the confluence of the Danube, Naab and Regen rivers. It is capital of the Upper Palatinate subregion of the state in the south of Germany. With more than 150,000 inhabitants, Regensburg is the f ...

under

Rabbeinu Tam Jacob ben Meir (1100 – 9 June 1171 (4 Tammuz)), best known as Rabbeinu Tam ( he, רבינו תם), was one of the most renowned Ashkenazi Jewish rabbis and leading French Tosafists, a leading ''halakhic'' authority in his generation, and a gra ...

and

Isaac ben Asher ha-Levi Rabbi Isaac ben Asher HaLevi or Riba (ריב"א) is the earliest known Tosafist, son-in-law of Eliakim ben Meshullam and pupil of Rashi. He flourished in Speyer during the 11th century. He is cited under the name of "Tosafot Riba," in the ''Temim ...

. In the following years, he served as the head of the city's

bet din A beit din ( he, בית דין, Bet Din, house of judgment, , Ashkenazic: ''beis din'', plural: batei din) is a rabbinical court of Judaism. In ancient times, it was the building block of the legal system in the Biblical Land of Israel. Today, it ...

. He compiled

tosafot The Tosafot, Tosafos or Tosfot ( he, תוספות) are medieval commentaries on the Talmud. They take the form of critical and explanatory glosses, printed, in almost all Talmud editions, on the outer margin and opposite Rashi's notes. The auth ...

to most tractates of the

Talmud The Talmud (; he, , Talmūḏ) is the central text of Rabbinic Judaism and the primary source of Jewish religious law (''halakha'') and Jewish theology. Until the advent of modernity, in nearly all Jewish communities, the Talmud was the cente ...

. A large number of his tosafot are on the tractate

Bava Batra Bava Batra (also Baba Batra; Talmudic Aramaic: בָּבָא בַּתְרָא "The Last Gate") is the third of the three Talmudic tractates in the Talmud in the order Nezikin; it deals with a person's responsibilities and rights as the owner of pr ...

, which are included in the first printed edition of the Talmud. He also known to have written tosafot on tractates

Pesaḥim Pesachim ( he, פְּסָחִים, lit. "Paschal lambs" or "Passovers"), also spelled Pesahim, is the third tractate of '' Seder Moed'' ("Order of Festivals") of the Mishnah and of the Talmud. The tractate discusses the topics related to the Jew ...

Mo'ed Katan Mo'ed Katan or Mo'ed Qatan (Hebrew: מועד קטן, lit. "little festival") is the eleventh tractate of ''Seder Moed'' of the Mishnah and the Talmud. It is concerned with the laws of the days between the first and last days of Passover and Sukk ...

Bava Kamma Bava Kamma ( tmr, בָּבָא קַמָּא, translit=Bāḇā Qammā, translation=The First Gate) is the first of a series of three Talmudic tractates in the order Nezikin ("Damages") that deal with civil matters such as damages and torts. The o ...

Shabbat Shabbat (, , or ; he, שַׁבָּת, Šabbāṯ, , ) or the Sabbath (), also called Shabbos (, ) by Ashkenazim, is Judaism's day of rest on the seventh day of the week—i.e., Saturday. On this day, religious Jews remember the biblical storie ...

, Ketubbot,

Gittin Gittin (Hebrew: ) is a tractate of the Mishnah and the Talmud, and is part of the order of Nashim. The content of the tractate primarily deals with the legal provisions related to halakhic divorce, in particular, the laws relating to the ''Get'' ...

Sotah Sotah ( he, סוֹטָה or he, שׂוֹטָה) is a tractate of the Talmud in Rabbinic Judaism. The tractate explains the ordeal of the bitter water, a trial by ordeal of a woman suspected of adultery, which is prescribed by the Book of Number ...

, Nazir, and Bava Meẓia. In his later life, Rabbi Isaac became embroiled in a controversy with Eliezer ben Nathan of Mainz, who criticized several of Rabbi Isaac's statements and in his reply, Rabbi Isaac is said to have treated him with great respect. Among his pupils where

Ephraim ben Isaac of Regensburg Ephraim ben Isaac ben Abraham of Regensburg (Hebrew: אפרים בן יצחק מרגנסבורג; 1175) also sometimes called Ben Yakir, was a 12th-century German tosafist and liturgical poet who was known for his keen intellect, his numerous piy ...

References

{{Rishonim 12th-century German rabbis Tosafists