1891-1956 1892-1956 20thcentury ambedkar asceticism bhimraoramji biography buddhism buddhistconvertsfromhinduism buddhistmonks buddhists communitydevelopment customsandpractices economicdevelopment historians history india japan politicalactivists religiousaspects religiouslifeandcustoms sarvodayamovement socialaspects socialconditions socialreformers srilanka statesmen sulaksivaraksa thailand women