As conflicting evaluations indicate, understanding and analysis of Da-Zhong period requires a more comprehensive approach. This is possible through cross-validation of various historical sources, but there are very few historical sources that convey the history of Da-Zhong period. Under these circumstances, the historical value of Dongguanzouji(東觀奏記) by Pei Tingyu(裴庭裕) is exceptional. Because, with the exception of Jiutangshu(舊唐書), Xintiangshu(新唐書) and Zizhitongjian(資治通鑑), which are the traditional books of Da-Zhong period, the one that remain intact as historical materials that fully describe the historical facts of Da-Zhong period is Dongguanzouji. In addition, the fact that Pei Tingyu directly participated in the compilation of the Annals further enhances the historical credibility of his description. Of course, there are also non-factual descriptions based on subjective perception in terms of personal work, but the fact that it presents specific cases that are difficult to understand without going through the contemporary period has high historical value. In terms of historical sourses, the second chapter of Dongguanzouji has some unique characters. First of all, it has a value as a unique record that is not confirmed in other sources. Second, the contents of Chapter 2 of Dongguanzouji were used as the basis for records by other works of later generations. Third, Chapter 2 of Dongguanzouji supplements the historical information of other extant sources. Lastly, Chapter 2 of Dongguanzouji also contains information on institutional regulations. Chapter 2 of Dongguanzouji not only conveys the historical facts of Da-Zhong period, but also includes the evaluation of Pei Tingyu’s moral value and public opinion evaluation within a certain range. This is to increase the historical value of Dongguanzouji.
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