Historical Mirror: The "Khitan Ruler" and the Tragedy of Later Jin in "Zizhi Tongjian"

Brief Introduction

In historical popularization, when mentioning the conflict between the "Khitan Ruler" and "Jin," readers often confuse the dynasties. The "Jin" referred to here is not the Western Jin or Eastern Jin established by the Sima clan, but rather the Later Jin (936–947) during the Five Dynasties and Ten Kingdoms period. As a chronological general history, the Zizhi Tongjian (Comprehensive Mirror to Aid in Government) records in detail the complex relationship of dependency and confrontation between the Khitan leaders (i.e., the Emperors of the Liao Dynasty) and the Later Jin regime. This period of history is not only a microcosm of the game between northern nomadic peoples and the Central Plains dynasty but also a key trigger for the fall of the Later Jin.

Core Knowledge Points

1. Key Figure: Yelü Deguang
The "Khitan Ruler" in the text primarily refers to Yelü Deguang (Emperor Taizong of Liao). He was an outstanding military commander of the Khitan tribe, described in the Zizhi Tongjian as a ruler of great talent and ambition. He supported Shi Jingtang in proclaiming himself emperor in exchange for the Sixteen Prefectures of Yan and Yun, and subsequently launched a southern invasion when the Later Jin attempted to become independent.

2. Political Deal: The Son Emperor and the Sixteen Prefectures
To seize the throne, Shi Jingtang, the founding emperor of Later Jin, submitted to the Khitan Ruler, calling himself a "son," and ceded the strategically vital Sixteen Prefectures of Yan and Yun. This event is viewed in the Zizhi Tongjian as a major turning point in the defense of the Central Plains dynasty, leading to the opening of the Central Plains' gateway, allowing Khitan cavalry to ride straight in.

3. Conflict Outbreak: From Allies to Mortal Enemies
Initially, both parties were allies. However, following the death of Shi Jingtang, his nephew Shi Chonggui succeeded him and attempted to break free from Khitan control, causing the relationship to collapse. The Khitan Ruler marched south under the pretext of "purifying the emperor's court," eventually capturing Bianjing (Kaifeng), leading to the fall of the Later Jin.

Connection with the Content of "Zizhi Tongjian"

When recording this history in the Zizhi Tongjian, Sima Guang did not simply list military battles but focused on the analysis of strategic gains and losses.

* Historical Records: The book explicitly records the words and deeds of "Khitan Ruler Deguang," such as his strict discipline upon first entering the Central Plains, and the details of later public resentment caused by poor governance.
* Historical Evaluation: Sima Guang revealed the fragility of regime changes during the Five Dynasties period by contrasting Shi Jingtang's humiliating survival with Shi Chonggui's stubbornness inviting disaster. The book points out that although the Khitan Ruler could win for a time, he failed to establish a stable rule in the Central Plains and was ultimately forced to return north, dying of illness during the journey.
Narrative Perspective: The Zizhi Tongjian*, in the form of "Chen Guang Yue" (Sima Guang says), warns future rulers not to trade territory for power, emphasizing the importance of stable border defense and national dignity.

Historical Insights

The conflict between the "Khitan Ruler" and the Later Jin reveals the costs of dependency versus independence in geopolitics. For modern readers, this history serves as a reminder that core interests (such as territorial sovereignty) are non-negotiable, and short-term political gains often come with long-term strategic risks.

Keywords: Zizhi Tongjian, Khitan Ruler, Later Jin, Yelü Deguang, Sixteen Prefectures of Yan and Yun, History Popularization