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Explanation:
Silk is a textile of ancient Chinese origin, woven from the protein fibre produced by the silkworm to make its cocoon, and was developed, according to Chinese tradition, sometime around the year 2,700 BC. Regarded as an extremely high value product, it was reserved for the exclusive usage of the Chinese imperial court for the making of cloths, drapes, banners, and other items of prestige. Its production was kept a fiercely guarded secret within China for some 3,000 years, with imperial decrees sentencing to death anyone who revealed to a foreigner the process of its production. Tombs in the Hubei province dating from the 4th and 3rd centuries BC contain outstanding examples of silk work, including brocade, gauze and embroidered silk, and the first complete silk garments.
The Chinese monopoly on silk production however did not mean that the product was restricted to the Chinese Empire – on the contrary, silk was used as a diplomatic gift, and was also traded extensively, first of all with China’s immediate neighbours, and subsequently further afield, becoming one of China’s chief exports under the Han dynasty (206 BC –220 AD). Indeed, Chinese cloths from this period have been found in Egypt, in northern Mongolia, and elsewhere.
At some point during the 1st century BC, silk was introduced to the Roman Empire, where it was considered an exotic luxury and became extremely popular, with imperial edicts being issued to control prices. Its popularity continued throughout the Middle Ages, with detailed Byzantine regulations for the manufacture of silk clothes, illustrating its importance as a quintessentially royal fabric and an important source of revenue for the crown. Additionally, the needs of the Byzantine Church for silk garments and hangings were substantial. This luxury item was thus one of the early impetuses in the development of trading routes from Europe to the Far East.
Knowledge about silk production was very valuable and, despite the efforts of the Chinese emperor to keep it a closely guarded secret, it did eventually spread beyond China, first to India and Japan, then to the Persian Empire and finally to the west in the 6th century AD. This was described by the historian Procopius, writing in the 6th century:
  About the same time [ca. 550] there came from India certain monks; and when they had satisfied Justinian Augustus that the Romans no longer should buy silk from the Persians, they promised the emperor in an interview that they would provide the materials for making silk so that never should the Romans seek business of this kind from their enemy the Persians, or from any other people whatsoever. They said that they were formerly in Serinda, which they call the region frequented by the people of the Indies, and there they learned perfectly the art of making silk. Moreover, to the emperor who plied them with many questions as to whether he might have the secret, the monks replied that certain worms were manufacturers of silk, nature itself forcing them to keep always at work; the worms could certainly not be brought here alive, but they could be grown easily and without difficulty; the eggs of single hatchings are innumerable; as soon as they are laid men cover them with dung and keep them warm for as long as it is necessary so that they produce insects. When they had announced these tidings, led on by liberal promises of the emperor to prove the fact, they returned to India. When they had brought the eggs to Byzantium, the method having been learned, as I have said, they changed them by metamorphosis into worms which feed on the leaves of mulberry. Thus began the art of making silk from that time on in the Roman Empire.
