Ancient Romans didn’t travel to China, it was too far and crossed too many different empires and terrains. They were aware of eachother from stories and goods that drifted across trade routes, but a single traveler wouldn’t complete the entire route.
When people did travel it was a whole operation with expensive logistical support and security and local guides and interpreters. If you traveled far you may have needed several interpreters to get from Gallic to Greek to Persian in the likely event you couldn’t find someone who spoke both Gallic and Persian.
Peasants simply didn’t travel, and the merchants and diplomats that did would bring large entourages.
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