This book is a sequel to the author?s earlier book Who were the Shudras? How they came to be the Fourth Varna of the Indo-Aryan Society about three social classes, whose existence has not received the attention it deserves. It is a unique source of information for the academicians, scholars and researchers of political science, modern Indian history, social work, and of course, Dalit studies. Contents Untouchability among the non-Hindus ? Untouchability among the Hindus ? Problem of Habitat ? Old theories of the Origin of Untouchability New Theories of the Origin of Untouchability ? The New Theories and some Hard Questions ? Untouchability and the Date of its Birth. About the Author B.R. Ambedkar (1891-1956) was born to Bhimabai Sakpal and Ramji in Mhow, MP. He was an eminent politician and jurist. Ambedkar?s efforts to eradicate the social evils like untouchability and casteism were remarkable. He fought for the rights of the dalits and socially backward classes. He served as India?s first Law Minister and was the architect of India?s Constitution.