interactions between nishapur and the silk road in the sasanian period

as the chief communication channel between eastern and western civilizations, the  silk road has played the significant role in the history of northeastern iran. the  silk road has provided a communicative way for commercial exchanges in one hand, and was in used by invader nomads in order to plunder of northeastern iran during many decades in other hand. the contacts have led to interaction between various cultures and caused the populations expansions along the  silk road. some metropolises such as nishapur shows very well the significant role of the  silk road in the formation process of human settlements. nishapur has continuously developed in the steady interaction with the silk road and has caused to flourish the road during the millennia. we can find some aspects of the process through studying historical documents and archaeological analysis.