A Modern Name for an Old Web
The phrase “Silk Road” is a modern label. The German geographer Ferdinand von Richthofen popularised it in 1877, and historians later began to speak of the Silk Roads in the plural, because the name describes many paths used over many centuries, not one highway with a single owner. No ancient traveller set out to follow “the Silk Road”, and very few people ever travelled its whole length. Most goods moved in stages, passed from one merchant or caravan to the next, changing hands and gaining a little in price at each stop.
Silk was only one of the goods. It was light, valuable and durable, which suited long-distance carrying, but horses, glass, metals, gemstones, spices, incense, paper and food plants moved along the same routes. So did religions, languages, stories and, in some periods, armies and diseases.
The Overland Legs
A common way to picture the overland network is as a chain of regions.
- North China. Routes began around the Han capital Chang’an (modern Xi’an) and ran northwest through the Hexi Corridor, a strip of oases between mountains and desert, to Dunhuang.
- The Tarim Basin. Beyond Dunhuang lay the Taklamakan Desert. Caravans skirted it by a northern branch through oasis towns such as Turfan and Kucha, or a southern branch through Khotan and Yarkand. The oasis settlements here are also where the preserved Tarim Basin mummies were found, a reminder that people lived in this region long before the caravans.
- The Pamirs and Ferghana. The two branches met around Kashgar, then crossed or skirted the high Pamir mountains into the valleys of Ferghana and the cities of Sogdiana, such as Samarkand and Bukhara.
- Iran and Mesopotamia. From Merv and the Iranian plateau, routes ran through Parthian and later Sasanian territory, where rulers taxed and sometimes controlled the passage of goods, toward Mesopotamia.
- The Mediterranean. The western end reached ports and cities of Syria and Anatolia, with desert caravan cities such as Palmyra and the Roman city of Antioch acting as meeting points.
There were also side branches. A northern steppe corridor was used by pastoral nomads long before Han envoys appeared, and the Xiongnu confederation and other steppe powers shaped who could travel it safely. A southern branch ran from Bactria into northwest India, in the region ruled for a time by the Kushan Empire, and linked the overland routes to Indian ports.
The Sea Routes
The overland routes were joined by sea lanes across the Indian Ocean and South China Sea, sometimes called the maritime Silk Road. Sailors relied on seasonal monsoon trade winds, which blow one way in one half of the year and reverse in the other, so that ships could cross to India and back on a predictable schedule. Spices, pearls, cotton, incense and later Chinese ceramics travelled by water, while the Red Sea and Persian Gulf connected these lanes to Egypt and Mesopotamia. In Arabia, the incense trade had its own long-standing caravan routes that fed into the same larger web.
Land and sea were not rivals so much as alternatives. A merchant might choose a sea leg for bulky cargo and a land leg for something light and costly, depending on politics, weather and tolls.
What Moved East and West
Typical goods moving east included glass, gold and silver vessels, wool and linen textiles, grapes, wine, horses, gemstones such as lapis lazuli from the mountains of what is now Afghanistan, and incense. Glass was especially valued in China, and the long history of ancient glassmaking in the eastern Mediterranean helps explain why. Moving west were silk, lacquerware, bronze mirrors, later porcelain, and eventually tea and paper. Jade from the Khotan region went east to China for many centuries.
Prices rose with every stage, so the same bolt of silk that was an ordinary payment in one place became a luxury in another. Roman writers complained about the money they thought flowed east to buy silk, though their figures should be treated with caution.
The People on the Road
The people who actually moved goods were usually specialists. Sogdian merchants from Central Asia dominated long stretches of the routes from roughly the 4th to the 8th century CE, and left letters, contracts and settlements across the region. Other travellers had different purposes:
- Envoys. The Han official Zhang Qian was sent west from about 138 BCE, and Chinese records mention another envoy, Gan Ying, who reached the Persian Gulf region around 97 CE.
- Monks and pilgrims. Chinese Buddhists such as Faxian (about 399 to 412 CE) and Xuanzang (in the 7th century) travelled to India for texts and teaching. Missionaries from India and Central Asia travelled the other way.
- Soldiers and officials. Garrisons, tax collectors and messengers kept the routes open, especially under strong states.
- Later European travellers. In the 13th century, Marco Polo and others travelled across Mongol-ruled Asia, where the Mongol conquests had briefly put much of the route under a single political system.
Rise, Change and Shift
The network grew in stages. Exchange across Eurasia predates the Han, but regular, state-supported traffic increased from the 2nd century BCE. It tended to flourish when large powers kept order: the Han, the Kushans, the Parthians, and later the Tang, whose capital Chang’an was a famously cosmopolitan city, and the Abbasid caliphate with its capital at Baghdad. It tended to contract when wars and political breakups made travel dangerous.
The older story that the routes simply “closed” at a particular date is too simple. Sea trade grew in importance across the first and second millennia CE, and overland traffic continued in various forms. What changed was the balance between routes, goods and powers, not the existence of long-distance exchange.
Reading the Evidence
Much of what we know comes from a mix of sources: Chinese histories, Greek and Roman geographical writings, travellers’ accounts, coin hoards, and finds from oasis sites such as Dunhuang, where sealed caves preserved thousands of manuscripts in many languages. These sources are uneven, and estimates of how much trade passed along the routes vary widely. It is safest to think of the Silk Road as a long-lived, shifting system of connections, with different stretches active at different times, rather than a fixed route with fixed traffic.