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c. 2700 BCE onwardReputable source · 2 sourcesWell documented

China Guards the Secret of Silk

For centuries, revealing how silk was made was punishable by death

On the timeline · around c. 2700 BCE onward · The Pax Mongolica and the Road's DeclineBefore Silk: Camels, Jade, and Lapis LazuliChina Guards the Secret of Silk2,500 BCE2,250 BCE2,000 BCE1,750 BCE1,500 BCE1,250 BCE1,000 BCE750 BCE

Quick facts

Fiber source
Cocoon of Bombyx mori, the domesticated silk moth
Legendary origin
Leizu, wife of the Yellow Emperor
Penalty for revealing the secret
Death, under Chinese law
Secret held for
Roughly 3,000 years before spreading abroad

What happened

Silk is a fiber unwound from the cocoon of the silkworm Bombyx mori, a moth whose domestication and use in China stretches back thousands of years, with legend crediting the Yellow Emperor's wife Leizu with discovering how to reel it. What set China apart was not just making the fabric but keeping the method secret: the World History Encyclopedia notes that the techniques of sericulture, raising the worms on mulberry leaves and reeling the filament from the cocoon, were guarded so closely that revealing them or smuggling eggs or cocoons out of the country was punishable by death. China held a functional monopoly on silk production for millennia even as the finished fabric traveled far beyond its borders, and only around the turn of the era did knowledge that silk came from a worm and not a plant reach the Mediterranean world at all.

Why it matters

A trade good that only one producer could make, and that decayed if left unclaimed, gave China enormous leverage over everyone downstream. Silk became the payment Han emperors used to buy off nomadic armies and the reason Parthian and Kushan middlemen could take a cut on every bolt heading toward Rome; the entire western half of the network existed to move a fabric its buyers could not replicate.

How we know

The World History Encyclopedia's overview of ancient silk draws on Chinese textual tradition around Leizu and on the well-documented later record of state secrecy, including capital punishment for revealing sericulture, and on the eventual spread of silk-making to Korea, Japan, and India by around 300 CE once the secret escaped Chinese control.

Sources

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Part of a timelineThe Silk Road29 events · How camel caravans, Sogdian merchants, and pilgrim monks stitched China to Rome, Byzantium, and the Islamic world across a thousand miles of desert and steppeView all →
China Guards the Secret of Silk · The Silk Road · SourcedStory