structural:scholar_edition
Central Asia and the Silk Road

Most merchants did not travel the entire Silk Road, but would trade goods through middlemen based in oasis towns, such as Khotan or Dunhuang. The Sogdians, however, established a trading network across the 1500 miles from Sogdiana to China. In fact, the Sogdians turned their energies to trade so thoroughly that the Saka of the Kingdom of Khotan called all merchants suli, "Sogdian", whatever their culture or ethnicity. The Sogdians had learnt to become expert traders from the Kushans, together with whom they initially controlled trade in the Ferghana Valley and Kangju during the 'birth' of the Silk Road. Later, they became the primary middlemen after the demise of the Kushan Empire.

Unlike the empires of antiquity, the Sogdian region was not a territory confined within fixed borders, but rather a network of city-states, from one oasis to another, linking Sogdiana to Byzantium, India, Indochina and China. Sogdian contacts with China were initiated by the embassy of the Chinese explorer Zhang Qian during the reign of Emperor Wu (r. 141–87 BC) of the former Han dynasty. Zhang wrote a report of his visit to the Western Regions in Central Asia and named the area of Sogdiana as " Kangju ".

Following Zhang Qian's embassy and report, commercial Chinese relations with Central Asia and Sogdiana flourished, as many Chinese missions were sent throughout the 1st century BC. In his Shiji published in 94 BC, Chinese historian Sima Qian remarked that "the largest of these embassies to foreign states numbered several hundred persons, while even the smaller parties included over 100 members... In the course of one year anywhere from five to six to over ten parties would be sent out." In terms of the silk trade, the Sogdians also served as middlemen between the Chinese Han Empire and the Parthian Empire of the Middle East and West Asia. Sogdians played a major role in facilitating trade between China and Central Asia along the Silk Roads as late as the 10th century, their language serving as a lingua franca for Asian trade as far back as the 4th century.

Subsequent to their domination by Alexander the Great, the Sogdians from the city of Marakanda (Samarkand) became dominant as traveling merchants, occupying a key position along the ancient Silk Road. They played an active role in the spread of faiths such as Manicheism, Zoroastrianism, and Buddhism along the Silk Road. The Chinese Sui Shu (Book of Sui) describes Sogdians as "skilled merchants" who attracted many foreign traders to their land to engage in commerce. They were described by the Chinese as born merchants, learning their commercial skills at an early age. It appears from sources, such as documents found by Sir Aurel Stein and others, that by the 4th century they may have monopolized trade between India and China. A letter written by Sogdian merchants dated 313 AD and found in the ruins of a watchtower in Gansu, was intended to be sent to merchants in Samarkand, warning them that after Liu Cong of Han-Zhao sacked Luoyang and the Jin emperor fled the capital, there was no worthwhile business there for Indian and Sogdian merchants. Furthermore, in 568 AD, a Turko-Sogdian delegation travelled to the Roman emperor in Constantinople to obtain permission to trade and in the following years commercial activity between the states flourished. Put simply, the Sogdians dominated trade along the Silk Road from the 2nd century BC until the 10th century.

Suyab and Talas in modern-day Kyrgyzstan were the main Sogdian centers in the north that dominated the caravan routes of the 6th to 8th centuries. Their commercial interests were protected by the resurgent military power of the Göktürks, whose empire was built on the political power of the Ashina clan and economic clout of the Sogdians. Sogdian trade, with some interruptions, continued into the 9th century. For instance, camels, women, girls, silver, and gold were seized from Sogdia during a raid by Qapaghan Qaghan (692–716), ruler of the Second Turkic Khaganate. In the 10th century, Sogdiana was incorporated into the Uighur Empire, which until 840 encompassed northern Central Asia. This khaganate obtained enormous deliveries of silk from Tang China in exchange for horses, in turn relying on the Sogdians to sell much of this silk further west. Peter B. Golden writes that the Uyghurs not only adopted the writing system and religious faiths of the Sogdians, such as Manichaeism, Buddhism, and Christianity, but also looked to the Sogdians as "mentors", while gradually replacing them in their roles as Silk Road traders and purveyors of culture. Muslim geographers of the 10th century drew upon Sogdian records dating to 750–840. After the end of the Uyghur Empire, Sogdian trade underwent a crisis. Following the Muslim conquest of Transoxiana in the 8th century, the Samanids resumed trade on the northwestern road leading to the Khazars and the Urals and the northeastern one toward the nearby Turkic tribes.

During the 5th and 6th century, many Sogdians took up residence in the Hexi Corridor, where they retained autonomy in terms of governance and had a designated official administrator known as a Sabao, which suggests their importance to the socioeconomic structure of China. The Sogdian influence on trade in China is also made apparent by a Chinese document which lists taxes paid on caravan trade in the Turpan region and shows that twenty-nine out of the thirty-five commercial transactions involved Sogdian merchants, and in thirteen of those cases both the buyer and the seller were Sogdian. Trade goods brought to China included grapes, alfalfa, and Sassanian silverware, as well as glass containers, Mediterranean coral, brass Buddhist images, Roman wool cloth, and Baltic amber. These were exchanged for Chinese paper, copper, and silk. In the 7th century, the Chinese Buddhist pilgrim Xuanzang noted with approval that Sogdian boys were taught to read and write at the age of five, though their skill was turned to trade, disappointing the scholarly Xuanzang. He also recorded the Sogdians working in other capacities such as farmers, carpetweavers, glassmakers, and woodcarvers.