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Bach Rav Yoel Sirkis
Bach Rav Yoel Sirkis
Rav Yoel Sirkis was born in 1561. He served as the Rav of Belz, Brest-Litovsk, and Cracow. His Bayit Chadash (Bach) is a major commentary on the Tur (second only to the Beit Yoseif). He was the father in law of the Taz (who frequently refers to him), and passed away in 1640
The Gaon Rabbi Joel Sirkis, who was known as the 'Bach', after his book, Bayit Chadash (New House), an explanation of the 4 parts of the 'Turim'. In the year 1618, Rabbi Joel Sirkis, the 'Bach', went to Cracow. According to legend, the Bach left the Rabbinate of Brest, because members of the congregation accused him, that one night the light in his house did not burn after midnight, a sign that he did not sit and study until late.


Rabbi Yoel Sirkis (i.e., The Bach, who was a Rabbi in Cracow some 50 years after the Rama) doubts the propriety of this custom (Costumes and Masquerading during Purim) , but wrote: "Let the Jew be, for it is better that they sin unintentionally and not sin intentionally... but every God fearing person should warn his household and anyone else who will listen to his voice that they should not transgress the prohibited negative commandment on Purim (The Bach on Tur Yoreh De'ah 182). 

R. Yomtov Lippman Heller [1579-1654], is known as the "Tosefos Yomtov," after his major commentary on the Mishna, the most famous of his many scholarly works. As a young man, he studied in Prague under the Maharal and subsequently under Rabbi Eliyahu Baal Shem, a predecessor of the Baal Shem Tov. In Cracow, he succeeded Rabbi Yoel Sirkis, the "Bach" as chief rabbi, and Yaakov Yehoshua, the Sema, as rosh yeshiva.