 Dov Ber of Mezeritch, the last unifying leader of most of the early elite movement, was the movement's first systematic thinker and architect, who cultivating a stellar "Hevrah Kadisha" (Holy Group) of disciples who would go on to disseminate Hasidic spirituality to different areas of Eastern Europe among the common masses, beginning the innovation of Hasidism's varying schools of thought.Among the disciples of the Maggid of Mezeritch, Elimelech of Lizhensk (1717–1787), who founded Hasidism in Poland-Galicia, wrote the early Hasidic classic work "Noam Elimelech" (1788), which developed the role of the Hasidic Tzadik into a full training of charismatic theurgic mystical "Popular/Practical Tzadikism".The work so cultivated the innovative social mysticism of leadership that it led to the proliferation of new Hasidic Tzadikim among leading disciples in Galicia and Poland.