Emperor Cheng of Han (Liu Ao): The Beginning of the Western Han's Decline Through the Lens of Zizhi Tongjian

Brief Introduction

Emperor Cheng of Han (51 BC – 7 BC), named Liu Ao, was the ninth emperor of the Western Han Dynasty and the son of Emperor Yuan. He reigned for twenty-six years (33 BC – 7 BC), marking a critical turning point from prosperity to decline for the Western Han Dynasty. Historians generally believe that although Emperor Cheng possessed a lenient character and favored Confucianism, his indulgence in pleasure led to the dominance of imperial relatives, laying the groundwork for Wang Mang's later usurpation of the Han throne. In history, he is often regarded as a typical representative of a "mediocre ruler."

Core Knowledge Points

1. Reign Period and Background: During the late Western Han period, although the national strength still remained, land annexation was severe, and social contradictions were intensifying. When Emperor Cheng ascended the throne, the court politics already showed signs of decline.
2. Favoritism of the Zhao Sisters: Emperor Cheng极度宠爱 (extremely favored) the sisters Zhao Feiyan and Zhao Heide, deposing Empress Xu and establishing Zhao Feiyan as Empress. Harem interference in politics was severe; the Zhao sisters even intervened in the succession of the Crown Prince, leading to bloody struggles within the palace.
3. Rise of the Wang Imperial Relatives: He relied heavily on his maternal uncle Wang Feng and his brothers. The Wang family gradually monopolized court politics, forming the situation known as the "Five Marquises of Wang." This became the foundation for Wang Mang's later usurpation.
4. Loose Court Discipline: He重用 (relied heavily on) eunuchs such as Shi Xian, excluding virtuous officials. Although there were famous ministers like Kuang Heng assisting in governance, the emperor did not listen to advice. Loyal and upright scholars were often marginalized, and bureaucratic corruption intensified.

Connection with Zizhi Tongjian

In the Zizhi Tongjian (Comprehensive Mirror in Aid of Governance), compiled by Sima Guang, the chapters on Emperor Cheng of Han do not merely record the daily life of the emperor; rather, they focus on the lessons regarding "order and chaos, rise and fall."

* Moral Warning: Sima Guang illustrates the viewpoint that "if the ruler's virtue is not cultivated, then court discipline cannot be upheld" by recording Emperor Cheng's indulgence in sensual pleasures and neglect of court affairs. The book details how the Zhao sisters intervened in the matter of deposing and establishing the Crown Prince, implying the destruction of the succession system caused by harem interference, thereby warning future rulers to prevent problems while they are still small.
Power Structure Analysis: The Zizhi Tongjian* keenly captures the process of the expansion of power by the Wang imperial relatives. Starting from Wang Feng becoming the Grand Marshal and General, Sima Guang records how the emperor gradually lost real power, viewing this process as a prelude to Wang Mang's usurpation. The book's description of the dictatorship of the Wang brothers reveals the mechanism of the shift of imperial power.
* Character Evaluation: The book's evaluation of Emperor Cheng leans negative, considering his "gentleness, benevolence, and fondness for Confucianism" to be actually weakness and incompetence. When facing advice from subordinates, he often turned a deaf ear, ultimately leading to the situation where "power shifted to imperial relatives, and politics emanated from eunuchs." Sima Guang uses the example of Emperor Cheng to emphasize the direct connection between a monarch's personal conduct and the fate of the nation.

Historical Insights

The life of Emperor Cheng of Han is a microcosm of the intensification of internal contradictions within the Western Han Dynasty. The Zizhi Tongjian uses this to warn future generations: when the highest ruler indulges in private desires while ignoring public justice, corruption within the bureaucratic system and the expansion of imperial relative power become inevitable, ultimately leading to the collapse of the dynasty. Understanding Emperor Cheng of Han helps us gain deeper insight into the operational logic and laws of rise and fall of ancient Chinese political power, holding high reference value for the study of Han Dynasty political history.