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
The rump kingdom under Punu, around the Orkhon (modern north central Mongolia) became known as the Northern Xiongnu. Punu, who became known as the Northern "Chanyu", began to put military pressure on the Southern Xiongnu.