Question

What did the government of ancient China do to enforce their monopoly on silk?

Answer 1

They only allowed a few specific Roman merchants to buy silk they made it a crime to export silk worms as well as their eggs they sold it a low price that no one could compete with they manufactured the silk in hidden locations

Answer 2

There was a ban on Silk Worm exportation

Step-by-step explanation:

It seems that silk only left China because of the the heir of a princess who was promised to a certain prince of Khotan. This most likely happened around the early 1st century AD. The princess, who refused to go to such a place without the silk that she loved so much decided to finally break the imperial ban on the silk-worm exportation.