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How did the silk trade help finance Justinian I’s empire?

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Mosaic detail of Emperor Justinian I with a jeweled crown and halo, wearing ornate robes, from the Church of San Vitale in Ravenna, Italy. — Justinian I Justinian I, detail of a mosaic in the Church of San Vitale, Ravenna, Italy.

The silk trade was a vital source of revenue for Justinian I, helping him finance his expensive military campaigns, building programs, and subsidies to foreign powers.1

Initially, the Byzantine Empire relied on imports of raw silk from the East, a trade that was often vulnerable to price hikes or disruptions caused by Persian hostility. To secure a more stable and profitable supply, Justinian successfully introduced sericulture to Constantinople. He achieved this by commissioning two Persian monks to smuggle silkworm eggs out of China in hollowed-out bamboo canes.123

Once the silkworms were established in the capital, the Byzantine government took firm control of the industry to maximize its financial benefits:

State Monopolies: The sale of raw silk was established as a government monopoly.1
Expansion of Control: Justinian’s finance minister, Peter Barsymes, extended this monopoly to include silk fabrics, creating a highly lucrative state-controlled industry.1

By domesticating the production process, the empire achieved an independent supply of silk, allowing the state to capture the profits from this luxury trade directly to support its imperial objectives.1