In the long history of China, many heroic figures and significant events have been recorded in official history, becoming legends passed down by later generations. However, there are also some figures and events that have been forgotten or neglected in official history due to various reasons, and Zhang Yichao is one of them. Then, why did official history forget Zhang Yichao? What are the historical reasons and background behind it? Zhang Yichao, an outstanding general in the Tang Dynasty, once led a lone army to defend Chang'an after the Anshi Rebellion, making significant contributions to the revival of the Tang Dynasty. However, there are few records about Zhang Yichao in official history, and even some historical books did not mention his name. Why is this? Firstly, we need to understand the compilation process of official history. Official history is a historical book compiled by the government, and its content is often influenced by political factors. During the Tang Dynasty, due to intense political struggles, some meritorious officials may be excluded and suppressed due to factional struggles, and their contributions and deeds may be ignored or deliberately downplayed in official history. This may be the case with Zhang Yichao. Although he made significant contributions in the Anshi Rebellion, his name and deeds were not recorded in official history due to political reasons. Secondly, the compilation of official history often has a lag. Official history is compiled by historians of the later dynasty after the change of dynasties. In this process, many historical materials may have been lost or missing, resulting in some important figures and events not being recorded completely. The deeds of Zhang Yichao may not have been recorded in official history due to the lack of historical materials. In addition, the compilation of official history is also influenced by historical concepts. In different historical periods, historians' evaluation criteria for historical figures and events will also be different. Some figures and events may not be valued in the historical concepts of the time, so they are not recorded in official history. This may be the case with Zhang Yichao. Although he achieved outstanding achievements in military affairs, he may not have been valued by historians at that time due to other reasons. In summary, the reason why official history forgot Zhang Yichao may be due to political factors, lack of historical materials, and the influence of historical concepts. However, this does not mean that Zhang Yichao's contributions and deeds are completely erased. We can still find records and evaluations about Zhang Yichao in unofficial historical materials such as unofficial history and family trees. Although these historical materials may contain exaggerations or inaccuracies, they are still important materials for us to understand and study Zhang Yichao. Nowadays, with the in-depth study of history and the excavation of historical materials, Zhang Yichao's name and deeds are gradually being understood and valued by people. As an outstanding general in the Tang Dynasty, he made significant contributions to the revival of the Tang Dynasty, which is an indelible historical fact. We should evaluate his contributions and achievements objectively and fairly, allowing his name and deeds to be inherited and promoted in the long history of the nation.

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