For 10 points, name this fiber produced by certain "worms."
Amoghavjra was a frequent recipient of gifts of this commodity from Emperor Taizong. The city of Lucca was known for their production of this commodity. Peter Barsymes created a government monopoly on this commodity. Workers in the city of Lyon that produced this commodity rose up in the Canut revolts. Going up the River During Qingming Festival was a work painted (*) on this medium. The technology necessary for its production was smuggled into the Byzantine Empire during the reign of Justinian. Sogdians were important traders in this resource, which was necessary for the vestments of clergy. Its production requires mulberry trees and this commodity gave its name to a trade route stretching from China to Rome. For 10 points, name this fiber produced by certain "worms."
Amoghavjra was a frequent recipient of gifts of this commodity from Emperor Taizong.
silk [do not accept paper if they buzz on this medium because Chinese art is notably mostly on silk!]