The Silk Road is the most well-known trading route of ancient Chinese civilization. Trade in silk grew under the Han Dynasty in the first and second centuries. Originally, the Chinese trade silk internally, within the empire. Caravans from the empire's interior would carry silk to the western edges of the region. Often small Central Asian tribes would attack these caravans hoping to capture the traders' valuable commodities. As a result, the Han Dynasty extended its military defenses further into Central Asia from 135 to 90 BC in order to protect these caravans. Chan Ch'ien, the first known Chinese traveler to make contact with the Central Asian tribes, later came up with the idea to expand the silk trade to include these lesser tribes and therefore forge alliances with these Central Asian nomads. Because of this idea, the Silk Road was born.Northwestern Indians who lived near the Ganges River played prominent roles as middlemen in the China-Mediterranean silk trade because as early as the third century AD, they understood that silk was a lucrative product of the Chinese Empire. The trading relationship between the Chinese and the Indians grew stronger with increased Han expansion into Central Asia. The Chinese would trade their silk with the Indians for precious stones and metals such as jade, gold, and silver, and the Indians would trade the silk with the Roman Empire. Silk proved to be an expensive import for the Roman Empire since its trade across Indian and Central Asia was heavily controlled by the Parthian Empire. While the Chinese silk trade played a minor role in the Chinese economy, it did increase the number of foreign merchants present in China under the Han Dynasty, exposing both the Chinese and visitors to their country to different cultures and religions. In fact, Buddhism spread from India to China because of trade along the Silk Route, similar to the way Islam spread along routes in medieval West Africa. .By 760 AD, d...