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Isaac ben Moses of Vienna Biography »
Isaac ben Moses of Vienna, also called Isaac Or Zarua or the Riaz, was one of the greatest rabbis of the Middle Ages. He was probably born in Bohemia and lived between 1200 and 1270. He attained his fame in Vienna and his major work, the halachic guide known as the Or Zarua, was very popular among Ashkenazic Jewry. He was a member of the Chassidei Ashkenaz and studied under many scholars, including the Ra'avyah, Rabbi Yehudah HaChasid, the Sar mi'Kutzi and Rabbi Elazar Rokeach. He was among the teachers of Rabbi Meir of Rothenburg.