What Was the Silk Road and Who Actually Controlled It?

The Silk Road Was Not a Road

The term "Silk Road" was coined by German geographer Ferdinand von Richthofen in 1877 — more than 1,400 years after the network had begun operating at scale. In Richthofen's time it made sense as a name: China was the world's dominant supplier of silk, and Central Asian trade routes were a major means of getting that silk to Western markets. But the name is misleading in almost every other respect. The Silk Road was not a single road but a shifting, multi-route network of paths, rivers, sea lanes, and mountain passes stretching across 6,000 to 9,000 kilometers of Eurasia. No single merchant or caravan traveled the full length from China to Rome. Goods were passed from trader to trader through a long chain of intermediaries, accumulating markup at each hand.

The routes were plural: northern steppe routes across Central Asia; southern oasis routes through cities like Samarkand, Bukhara, and Dunhuang; maritime routes through the Indian Ocean and Persian Gulf; and various combinations thereof depending on the political situation along each corridor at any given time. The entire network was not simultaneously active or under unified administration at any point in history — it ebbed and flowed with the rise and fall of the empires that controlled different segments.

What Actually Traveled the Routes

Silk was important but far from the only — or even necessarily the dominant — commodity in Silk Road trade at most periods. Eastward from West to East: gold and silver (Roman and later Byzantine and Islamic coinage), glassware (of which China had little tradition before Silk Road contacts), horses (Central Asian breeds highly valued in China), wool textiles, ivory, coral, and amber. Westward from East to West: silk (most valuable), porcelain (from the Song dynasty onward), spices (especially pepper, cinnamon, and cloves, though many of these were intermediated through Indian Ocean maritime routes), paper, gunpowder, and iron goods.

Equally important — and harder to trace — was the movement of ideas, religions, and technologies. Buddhism traveled from India through Central Asia to China and Korea along Silk Road routes, carried by missionaries and monks who embedded themselves in oasis communities. Islam spread with extraordinary speed through the same networks after the seventh century. Paper-making technology, invented in China around the first century CE, reached the Islamic world by the eighth century and Europe by the twelfth. Block printing technology traveled westward. Mathematical concepts including the zero, place-value notation, and Arabic numerals (themselves derived from Indian notation) moved westward in part through trading communities. The Silk Road was a transmission belt for civilization as much as for commodities.

Who Controlled the Routes and When

No empire controlled the full extent of the Silk Road at any period, but several successive powers dominated key segments and profited enormously from doing so. In the first centuries CE, the Parthian Empire (and later the Sassanid Persian Empire) controlled the crucial middle segment between China and Rome, jealously guarding their position as intermediaries and actively preventing direct diplomatic contact between the two great powers. When Rome sent envoys to find the source of silk, they were turned back by Parthian merchants who had no intention of allowing their advantageous middleman position to be circumvented.

The Tang Dynasty China (618-907 CE) oversaw one of the Silk Road's most celebrated periods. Tang Chang'an (modern Xi'an), with a population of nearly one million, was arguably the most cosmopolitan city in the world — home to Sogdian, Persian, Arab, Korean, and Japanese merchants, alongside Nestorian Christian churches, Zoroastrian fire temples, Buddhist monasteries, and Manichaean communities. The Tang government maintained diplomatic relations across Central Asia and subsidized the route through military protection of key oases.

The Sogdians: The Silk Road's Essential Merchants

If one people deserves the title of Silk Road operators, it is the Sogdians — an Iranian people from the Zerafshan River valley in modern Uzbekistan (centered on cities including Samarkand and Bukhara). Between roughly the fourth and eighth centuries CE, Sogdian merchants built a commercial network spanning from China to the Byzantine Empire and into India, establishing trading colonies in oasis cities throughout Central Asia and in the Tang capital itself. Sogdian letters discovered in a watchtower near Dunhuang — the earliest surviving documents in the Sogdian language, dating to approximately 313 CE — record detailed commercial transactions, family correspondence, and market intelligence spanning thousands of kilometers.

The Sogdians were linguistically flexible, religiously diverse (practicing Zoroastrianism, Buddhism, Manichaeism, and later Islam), and organizationally sophisticated, developing credit instruments and trading partnerships that would not look out of place in a modern commercial context. Their decline came with the Arab conquest of Sogdiana in the early eighth century and the subsequent disruption and reorientation of trade patterns — though many Sogdians simply converted to Islam and continued their commercial activities under new political masters.

The Mongol Century and the Pax Mongolica

The Mongol conquests of the thirteenth century, initially catastrophically destructive (the sack of Samarkand, Baghdad, and other Silk Road cities caused immense mortality and displacement), paradoxically created the conditions for the Silk Road's most intensive period of transcontinental movement. By 1279, the Mongol Empire — divided into successor states but still nominally unified — controlled the largest contiguous land empire in history, stretching from China to Eastern Europe. For a period of roughly 70 years (approximately 1250 to 1350), the Pax Mongolica made it safer to travel from one end of Eurasia to the other than at almost any time before or since.

It was in this context that Marco Polo traveled from Venice to the court of Kublai Khan (1271-1295), that the Franciscan friar William of Rubruck traveled to Mongolia in 1253-1255, and that Ibn Battuta of Morocco could travel 75,000 miles across the Eurasian world in a single remarkable career (1325-1354). The Pax Mongolica also facilitated the transmission of plague — the Black Death appears to have spread along Mongol trade networks from Central Asia westward into Europe in 1347, riding the same routes that carried silk and spice.

The Maritime Alternative and the Silk Road's Decline

The fifteenth century Portuguese voyages that opened direct sea routes from Europe around Africa to Asia effectively ended the dominance of the overland Silk Road for European trade. Vasco da Gama's 1498 arrival in Calicut demonstrated that Europeans could reach the sources of spice and silk directly, bypassing the long chain of intermediaries and the Ottoman Empire's control of eastern Mediterranean trade. Maritime routes were not faster for individual journeys but allowed much larger cargo volumes at lower cost per unit, and were not subject to tolls and instability along thousands of kilometers of overland passage.

The overland routes did not disappear immediately — trade continued along them for centuries, and Russia's expansion across Siberia in the seventeenth century created new overland connections to China. But the strategic centrality of the overland routes to world trade ended with the Age of Exploration. The modern Belt and Road Initiative, China's massive twenty-first century infrastructure investment program, explicitly invokes the historical Silk Road as both a precedent and a legitimating narrative for linking Eurasia through Chinese-funded roads, railways, and ports.