The silk Road made it to Istanbul and this is a clear bridge between Taoism buddhism Greek around 250 BC
I can only imagine the road developed from existing trading routes
The silk road is how I know that anything silk road to today had brisk trading not only food or fabric but also language and religion and cultures.
it baffled me for years why Indian iconography and Greek iconography and ancient Chinese art were similar in a lot of ways.
but once I realize the significance of the silk road it clicked.
Chinese know about Greek philosophers at the time of Christ.
greeks know about Buddhism
it really opened up my way of thinking.