Tong Ping Zhang Shi: Core Evolution of the Tang Dynasty Chancellor System and an Interpretation of Zizhi Tongjian

Brief Introduction

"Tong Ping Zhang Shi" is one of the most representative chancellor titles of the Tang Dynasty, with the full title being "Tong Zhongshu Menxia Ping Zhang Shi" (Equalizing Affairs with the Secretariat and Chancellery). In the Tang official system, it signified that an official, though not the head of the Secretariat or Chancellery (such as the Head of the Secretariat or Head of the Chancellery), possessed the same power to participate in policy deliberations as the department heads. The establishment of this system marked the transition of the Tang chancellor system from the "Three Departments System" to the "Zhongshu Menxia System," serving as a key to understanding the power dynamics between imperial authority and ministerial power during the Tang Dynasty.

Core Knowledge Points

* Origin and Evolution of the System: In the early Tang Dynasty, chancellors were primarily heads of the Three Departments. Due to the prestige of these positions, the emperor often granted the title "Tong Ping Zhang Shi" to officials holding other posts, allowing them to participate in critical affairs. After Emperor Gaozong, this title gradually became normalized and became the primary designation for chancellors.
Scope of Actual Power: Holders of this title could enter the "Council of State" (Zhengshitang*) for deliberations and sign imperial edicts, making them legal chancellors. They were responsible for handling daily state affairs and formed the core group for central decision-making.
* Tool for Imperial Centralization: The emperor could flexibly adjust the number and selection of chancellors by granting or revoking this title without needing to change high-ranking official grades. This design of "low title but high power" effectively prevented powerful ministers from monopolizing court politics and strengthened imperial control.
* Changes in Mid-to-Late Tang: Over time, this title became increasingly proliferated in the mid-to-late Tang Dynasty, sometimes even becoming a nominal title. This reflected the gradual loss of control over central power and the rise of eunuch influence during the Tang Dynasty.

Connection with the Content of Zizhi Tongjian

Sima Guang's records of "Tong Ping Zhang Shi" span throughout the Tang volumes of Zizhi Tongjian. These records are not merely official position logs but also serve as political barometers.

1. Precise Recording of Power Succession: The book details the specific times when figures such as Li Linfu, Yang Guozhong, and Li Deyu were granted or dismissed from the title of "Tong Ping Zhang Shi." These nodes often correspond to court turmoil or policy shifts. For example, the Tang Annals record Li Linfu becoming chancellor during the Xuanzong period, marking the transition from the Kaiyuan Prosperity to the Tianbao Crisis.
2. Embodiment of Imperial Will: In Zizhi Tongjian: Tang Annals, the emperor's appointment of "Tong Ping Zhang Shi" was often accompanied by the purging of previous ministers. Through his writing style, Sima Guang reveals how this title became a tool for the emperor to balance aristocratic families and powerful ministers, showcasing the power game beneath the surface of "joint governance between monarch and ministers."
3. Witness to Institutional Decay: The book records the phenomenon in the mid-to-late Tang period where the title was granted frequently and even abused. Sima Guang uses this to comment on the gradual loss of control over Tang central power, providing a historical mirror for the rise and fall of institutions for future generations.

Summary

"Tong Ping Zhang Shi" is not merely an official title but a microcosm of the Tang Dynasty's political ecology. Combined with the narrative of Zizhi Tongjian, readers can more clearly see how this system evolved from a sharp tool for strengthening centralization into a carrier of factional strife and turmoil. For those studying the history of ancient Chinese official systems and Tang political history, understanding this title is crucial.