Manu Smriti, the Hindu Law Book, is the oldest law book in the world. It is older than Hammurabi's law book. I have given the details for my dating in this book. Manu Smritis is not followed anywhere in India now or earlier. But all ancient Tamil and Sanskrit authors have praised Manu Neeti (Manu's Justice). Though we have more than 20 Hindu law books, Manu being the first, everyone praised it as a model book.