The Kotzk Hasidic dynasty is a branch of Hasidic Judaism founded in the early 19th century by Rabbi Menachem Mendel of Kotzk. Known for its emphasis on authenticity and inner spirituality, the dynasty attracted followers seeking a deeper connection to their faith. Rabbi Mendel was known for his sharp intellect and often challenged conventional practices, encouraging his disciples to engage in self-examination and personal growth. The main center of the Kotzk dynasty was in the town of Kotzk in Poland. After Rabbi Mendel's passing in 1866, the leadership passed to his disciples, with the most notable being Rabbi Yaakov of Kotzk. The dynasty's teachings continue to influence various Hasidic groups and emphasize the importance of sincerity in religious practice.