Maggid of Mezritch

Known as the Maggid of Mezritch, Rabbi Dov Ber was the principal disciple of the Ba'al Shem Tov and his successor as leader of the nascent Hasidic movement. He established his court in Mezhirichi, which became the epicenter from which Hasidut expanded across Eastern Europe. A formidable Talmudist before joining the movement, he is credited with systematizing Hasidic doctrine. His teachings were transcribed by his disciples in works like *Maggid Devarav L'Yaakov* and *Ohr Torah*, and his students included the founders of many major Hasidic dynasties.