Five Chanyus Contending for Power: Xiongnu Internal Chaos and the Turning Point of Han-Xiongnu Relations

Brief Introduction

Five Chanyus Contending for Power refers to the intense internal turmoil within the Xiongnu triggered by succession issues in 57 BC (the first year of Wufeng under Emperor Yuan of Han). At that time, after the death of the Chanyu, five brothers simultaneously declared themselves Chanyus, leading to endless warfare among them. This event not only marked the end of Xiongnu unified hegemony but also directly led to the split of the Xiongnu into Northern and Southern factions, profoundly altering the Han Dynasty's frontier strategy and the geopolitical landscape of the Eurasian continent.

Core Knowledge Points

1. Time and Background: Occurred in the first year of Wufeng under Emperor Yuan of Han (57 BC). Prior to this, although the Xiongnu had been weakened by the strikes during Emperor Xuan's reign, they still posed a threat. After the Chanyu's death, the succession law was chaotic, leading to a power vacuum.
2. Key Participants: Among the five contending Chanyus, the most influential were Chanyu Huhanye and Chanyu Zhizhi. The other three Chanyus failed or perished in the internal strife, eventually forming a North-South standoff between Huhanye and Zhizhi.
3. Key Turning Point: Chanyu Huhanye was at a disadvantage in the civil war, so he decided to submit to the Han Dynasty, requesting protection from the Han Court. This move broke the century-long stalemate of war between Han and Xiongnu, opening a new model of "marriage alliance (Heqin)" and "loose-rein policy (Jimí)".
4. Historical Consequences: The Xiongnu formally split. The Southern Xiongnu attached themselves to the Han Dynasty, while the Northern Xiongnu (Zhizhi's faction) migrated west, ultimately triggering a chain reaction that influenced the historical process of Central Asia.

Connection to Content in Zizhi Tongjian

In the Zizhi Tongjian · Han Ji, Sima Guang's record of the "Five Chanyus Contending for Power" is particularly detailed. The narrative focus is not only on the war itself but also on the decision-making process of the Han Court.

* Record of Political Gaming: Sima Guang recorded the intense debates among court officials during Emperor Yuan's reign regarding whether to accept Chanyu Huhanye. Confucians led by Xiao Wangzhi advocated the "loose-rein policy," opposing excessive acceptance, while Grand General Wang Feng and others advocated using the Xiongnu internal chaos to consolidate border defense. This record reflects the strategic divergence within the Han Dynasty regarding frontier policy.
Insight into Historical Causality: Through this event, Zizhi Tongjian* elucidates the historical law of "prosperity inevitably leads to decline." The Xiongnu destroyed their own great wall due to internal splitting, while the Han Dynasty gained strategic initiative through flexible diplomatic strategies (such as sending the Commissioner of Allied Kingdoms to handle affairs).
* Foreshadowing Character Fate: The book's description of Chanyu Huhanye lays the groundwork for his later famous "Zhaojun Crossing the Pass" marriage alliance event, reflecting Sima Guang's profound understanding of the interweaving of character fate and historical trends.

Summary

"Five Chanyus Contending for Power" is the watershed from prosperity to decline for the Xiongnu. Through the lens of Zizhi Tongjian, we can not only see the power succession of steppe nations but also appreciate how the Han Dynasty, through diplomatic wisdom, transformed military pressure into political advantage, thereby laying the foundation for a century of frontier peace thereafter.