Evidence for Rome establishing relations/ contact with China

[Theodosius the Great]

Yes, the old Crassus theory does seem farfetched. Commerce is the more likely medium of contact.

In 552 AD, Justinian sent two monks to the East to smuggle back some silk worm eggs so that the Empire could establish its own silk industry to get around the Persian middleman. The monks succeeded in their mission but I'm not sure if they entered Chinese territory to get the eggs. Anyone know for sure ?

~Theo