 For example, in China during the Zhou Dynasty (1046 – 256 BC), in India during the Vedic Era (1500 – 500 BC), and in the military camps that spread throughout the Roman Empire (31 BC – 476 AD).As the residential districts made up the majority of the city, that early form of districting was usually along ethnic and occupational divides; generally, class or status diminished outwards from the city center.One legal form for enforcing it was the caste system.