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Yitzchak Myer Alter (also Rottenburg, Rothenburg or Rothenberg as an alternate for "Alter") (1798 - March 10 1866), was also known as the Chidushei Harim for his Torah book/s. He is sometimes referred to fondly as Reb Itche Myer by his followers. He was an Orthodox Judaism rabbi and founder of the Ger (Hasidic dynasty) within Hasidic Judaism in the town of Góra Kalwaria ("Ger" in short) in Poland. He came from a very distinguished family of rabbis, among the most prominent in Germany and Poland. He was a descendant of Rashi, and R. Meir ben Baruch of Rothenburg (1215 - 1293) the Tosafist. He is considered to be the first rebbe (Hasidic spiritual leader) of the Ger Hasidic dynasty.