Another autonomous routes of the Silk Road

Exactly at the same time historians learned about the existence of another autonomous routes of the Silk Road network. This subnetwork was called Persian Royal Road and extended to almost two thousand miles. Its origin was dated to the fifth century BC. This road was maintained and protected by the ancient Persian rulers and it even had postal stations and relays at regular intervals!

Royal couriers had at their disposal fresh horse and riders at each relay. They could carry messages the entire distance in nine days, though normal travelers covered the same distance within three months. Persian Royal Road subnetwork included the routes to India and Central Asia. In fact, Persian rulers encouraged regular contact between India, Mesopotamia and the Mediterranean. Even in the Biblical Book of Esther, there are accounts of dispatches being sent to provinces as far out as India.