I want to know the answer to the following question:
Who was the chieftain of the Xiongnu?
All the background I'm provided with is that "To the north of China proper, the nomadic Xiongnu chieftain Modu Chanyu (r. 209–174 BC) conquered various tribes inhabiting the eastern portion of the Eurasian Steppe.". Is that enough to answer the question?
Answer: yes