Mahar is one of the Indian caste found largely in the state of Maharashtra and neighbouring areas. Most of the Mahar community followed B. R. Ambedkar in converting to Buddhism in the middle of the 20th century. As of 2017 the Mahar caste was designated as a Scheduled Caste in 16 Indian states.
Most Mahars converted to Buddhism in response to the injustices of the caste system practiced within Brahmanism. Thus, the practice of untouchability began and continued for generations. It was the primary reason for most of the Mahar community to follow Dr. B. R. Ambedkar in embracing Buddhism and re-establishing it in the middle of the 20th century.
Most of the Mahar trace their descent from the Mahabharatas Pandava. The Mahar claim to have taken part in the Mahabharata war and subsequently settled in Maharashtra. From Wikipedia