Nomadic empire
The Xiongnu were a confederation of nomadic tribes from Central Asia with a ruling class of unknown origin and other subjugated tribes. They lived on the Mongolian Plateau between the 3rd century BC and the 460s AD, their territories including modern day Mongolia, southern Siberia, western Manchuria, and the modern Chinese provinces of Inner Mongolia, Gansu, and Xinjiang. The Xiongnu was the first unified empire of nomadic peoples. Relations between early Chinese dynasties and the Xiongnu were complicated and included military conflict, exchanges of tribute and trade, and marriage treaties. When Emperor Qin Shihuang drove them away from the south of the Yellow River, he built the famous Great Wall to prevent the Xiongnu from coming back.
Luandi
The Luandi was a clan that held some of the highest positions in the Xiongnu society, including the title of chanyu within the Xiongnu confederacy. In the confederation, Luandi was a paternal dynastic tribe, Huyan was an initially maternal dynastic tribe, and Xubu was a subsequently maternal dynastic tribe. They were the three most prominent tribes ("Houses" in N. Bichurin) in the Xiongnu.