Rav Yehuda Meir Shapiro of Lublin (1887-1933). His father, Rav Yaakov Shimshon Katz of Shatz, Romania, was a descendent of Rav Pinchas Koretz, a disciple of the Baal Shem Tov. His mother, Margala, was the daughter of Rav Shmuel Yitzchak Schor, author of Minchas Shai, and a descendent of the author of Tevu’as Shor. He was also a descendent of Rav Bechor Shor of Orleans, one of the Baalie Tosefos. He was married in 1906 and took his first appointment, Rav of Galina, in 1911. In 1921, he became Rav of Sanok, then in 1924 Rav of Piotrkov. It was while there that he wrote his sefer Or HaMeir. Also in 1923, he began the first cycle of Daf Yomi, having shared this idea at the first Knessiah Gedolah of Agudath Yisrael the previous year.
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