Zhang Qian was a Chinese diplomat, explorer, and politician who served as an imperial envoy to the world outside of China in the late 2nd century BC during the Western Han dynasty. He was one of the first official diplomats to bring back valuable information about Central Asia, including the Greco-Bactrian remains of the Macedonian Empire as well as the Parthian Empire, to the Han dynasty imperial court, then ruled by Emperor Wu of Han.

The Han dynasty was an imperial dynasty of China, established by Liu Bang and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–206 BC) and a warring interregnum known as the Chu–Han contention (206–202 BC), and it was succeeded by the Three Kingdoms period (220–280 AD). The dynasty was briefly interrupted by the Xin dynasty (9–23 AD) established by the usurping regent Wang Mang, and is thus separated into two periods—the Western Han and the Eastern Han (25–220 AD). Spanning over four centuries, the Han dynasty is considered a golden age in Chinese history, and had a permanent impact on Chinese identity in later periods. The majority ethnic group of modern China refer to themselves as the "Han people" or "Han Chinese". The spoken Sinitic language and written Chinese are referred to respectively as the "Han language" and "Han characters".