Silk Before the Routes
Silk was being made in China long before the Han dynasty (206 BCE to 220 CE) took an interest in the lands to its west. Silk comes from the cocoon of the domesticated silk moth, Bombyx mori. The cocoon is a single continuous filament that can be unwound, or reeled, then twisted into thread and woven. Later traditions credit the invention to a legendary empress, but archaeologists simply trace silk textiles back several thousand years in China, without a precise starting point.
By the Han period silk production was a large, organised industry. Farming households raised silkworms and wove cloth as part of ordinary rural life, and women’s work in particular was praised in official writing as a pillar of the economy. Alongside household production were larger workshops, including official ones, which made fine patterned fabrics for the court. Tombs such as those at Mawangdui, near Changsha and dating to the 2nd century BCE, contained silk garments and textiles in remarkable condition and show how skilled the weavers were. Textile making of this kind also depended on wider craft knowledge, as the history of ancient weaving shows.
Why the Han State Wanted Silk
Silk was more than a luxury for the Han. It was used as a form of payment and wealth. Officials and soldiers could be paid partly in bolts of silk, and administrative records from frontier garrisons mention cloth in this role. Silk also served a diplomatic purpose. In the early Han, relations with the Xiongnu confederation on the northern steppe relied on gifts of silk, grain and other goods, sometimes together with marriage alliances, in the hope of keeping raiding in check.
When Emperor Wu (reigned 141 to 87 BCE) shifted to a more aggressive policy, silk continued to flow outward, now as a tool for winning allies among the peoples of the western regions and rewarding loyal groups. Chinese records suggest that very large quantities were handed out as gifts and subsidies. The exact totals are uncertain, but the picture is clear: much early silk “export” was driven by state policy and diplomacy, not by merchants alone.
From Chang’an Westward
The capital of the Western Han was Chang’an, and from there caravans and official parties headed northwest through the Hexi Corridor to Dunhuang, where the Han built garrisons, beacon towers and wall sections to protect travellers. Builders extended earlier traditions of early wall building to guard the corridor. Beyond that lay the oases of the Tarim Basin, where local rulers and Han officials negotiated passage.
Silk crossed these oasis states in stages. At the far end, Parthian and other intermediaries handled much of the trade further west, so silk reaching Mediterranean markets had often passed through many hands. Chinese sources speak of a distant land called Daqin, usually identified with the Roman world, but direct contact between Han China and Rome was extremely limited and the details are debated.
What Came Back
In return, China received goods and plants that were new to it or rare.
- Horses. The Han valued the large horses of the Ferghana valley, which Chinese sources call “heavenly horses”. Cavalry mattered because the steppe powers fielded mounted archers with the composite bow, and a good horse was a military asset. Obtaining them became an object of diplomacy and, around 104 to 101 BCE, of a costly Han campaign.
- Plants. Later tradition credits Han envoys with bringing back grapevines and alfalfa, the latter as horse fodder. Some of these attributions are traditional rather than firmly documented, and plant movement probably involved many people over time.
- Glass, gems and metalwork. Glass vessels, beads and objects of gold and silver reached China along the oasis routes, and jade from Khotan went to the Chinese court.
- Musicians, entertainers and fashions. Foreign performers and styles gradually became part of elite culture, a trend that grew much stronger under the later Tang cosmopolitan empire.
Ideas as Well as Goods
Contact brought knowledge and religion as well as objects. Buddhism is traditionally said to have reached China during the Han, probably in the 1st century CE, carried by merchants, missionaries and travellers from the Kushan Empire and Central Asia. Its early presence was modest, but it laid the foundation for a much larger movement in later centuries. How religions and technologies spread more widely is a separate topic from the Han export story.
Limits and Caution
It is easy to overstate the scale of the Han trade. Silk found in a distant grave does not tell us how many other bolts were never preserved, and historians disagree over how much silk was traded by private merchants as opposed to being given away by the state. Rome-bound shipments are especially hard to estimate. What is secure is that silk was central to Han economic and diplomatic life, that the state actively promoted the westward flow, and that exchange moved in both directions, bringing in horses, plants and new ideas that quietly changed Chinese life.
Production also did not stay a Chinese monopoly. Sericulture reached places such as Khotan by the early centuries CE, according to tradition, and by the 6th century Byzantine writers described silkworms being brought to the Mediterranean. The details of those stories are legendary in part, but they show that the secrets of silk gradually spread beyond China.