Zhang Qian - founder of the Silk Road
The unified Chinese Empire, which was born in the 3rd century BC, came under serious threat soon after its establishment. The Asian Huns (Xiongnus), who had harassed the former northern principalities for a century and then pushed north in the Chinese campaigns of 210 BC, were replaced in 209 BC by a new leader, Modu (Maodun), who soon established the first East Asian Steppe Empire.