Rabbi Yaakov of Kotzk, also known as the Kotzker Rebbe, was a prominent Hasidic leader in the 19th century. Born in 1787 in Kock, Poland, he became known for his sharp intellect and deep spiritual insights. He founded the Kotzk Hasidic dynasty, emphasizing authenticity and sincerity in religious practice. The Kotzker Rebbe was known for his unconventional approach to Judaism, often challenging established norms and encouraging his followers to seek a personal connection with God. He passed away in 1866, leaving a lasting impact on the Hasidic movement and inspiring many with his teachings on truth and self-examination.