Xiongnu
The Xiongnu () were a confederation of nomadic peoples who, according to ancient Chinese sources, inhabited the eastern Asian Steppe from the 3rd century BC to the late 1st century AD. Chinese sources report that Modu Chanyu, the supreme leader after 209 BC, founded the Xiongnu Empire.
Xiongnu
Under Modu's leadership, the Xiongnu threatened the Han dynasty, almost causing Emperor Gaozu, the first Han emperor, to lose his throne in 200 BC. By the time of Modu's death in 174 BC, the Xiongnu had driven the Yuezhi from the Hexi Corridor, killing the Yuezhi king in the process and asserting their presence in the Western Regions.