Rabbi Schneur Zalman of Liadi, 1745-1812, founder and first Rebbe of the Chabad branch of chassidism, known also as “the Rav,” and as Baal HaTanya; lived in Li'ozna and Liadi, White Russia; author of Tanya, a classic text of the chassidic tradition, and Shulchan Aruch HaRav, a code of Jewish law.