Rabbi Menachem Mendel Schneerson (Tzemach Tzedek)

Rabbi Menachem Mendel Schneerson of Lubavitch, the Tzemach Tzedek, 3rd Lubavitcher Rebbe (1789-1866). Raised by his grandfather, the Alter Rebbe, he authored extensive responsa and Chassidic discourses. He was known for his vigorous defense of Jewish rights in Tsarist Russia and his encyclopedic knowledge spanning all areas of Torah and Chassidut.