Bhimrao Ramji Ambedkar was an Indian jurist, Bahujan political leader and a Buddhist revivalist, who is the chief architect of the Indian Constitution, also known as Babasaheb. Born into a poor Untouchable community, Ambedkar spent his life fighting against the system of Chaturvarna, the Hindu categorization of human society into four varnas and the Indian caste system. He is also credited for having sparked the Dalit Buddhist movement. Ambedkar has been honoured with the Bharat Ratna, India's highest civilian award, given for the highest degree of national service.