Your vote on this answer has already been received
Bhimrao Ramji Ambedkar (Marathi:)14 April 1891 6 December 1956), also known as Babasaheb, was an Indian jurist, political leader, Buddhist activist, philosopher, thinker, anthropologist, historian, orator, prolific writer, economist, scholar, editor, revolutionary and a revivalist for Buddhism in India. He was also the chief architect of the Indian Constitution. Born into a poor Mahar (then considered an Untouchable caste) family, Ambedkar spent his whole life fighting against social discrimination, the system of Chaturvarna the categorization of Hindu society into four varnas and the Hindu caste system. He is also credited with providing a spark for the conversion of hundreds of thousands of untouchables to Theravada Buddhism. Dr. Ambedkar was posthumously awarded the Bharat Ratna, India's highest civilian award, in 1990.