During the succession of dynasties, many historical records may be tampered with or adjusted for various political purposes. Here are some key aspects that may be tampered with: 1. **Image of the previous ruler**: In order to justify its own rule, the new dynasty may belittle the ability or moral character of the previous ruler, describing them as tyrants, incompetent or corrupt, which can enhance its legitimacy. 2. **Narrative of major events**: Major historical events such as wars, rebellions, and disasters may be reinterpreted. For example, a failed battle may be portrayed as a strategic retreat, or civil unrest during the change of dynasties may be glorified as a righteous uprising. 3. **The identity and deeds of the founding monarch of the new dynasty**: The new dynasty may glorify the founding monarch's origin and the process of establishing the country, emphasize his orthodoxy and divine ordination, and create a heroic image by selectively ignoring or tampering with unfavorable records. 4. **Legitimacy of orthodoxy**: In order to suppress potential political opponents, the new dynasty may change the records of blood, marriage, or other relationships between the previous dynasty and the new dynasty to strengthen its orthodoxy. 5. **Policy achievements and reforms**: A new dynasty may exaggerate its achievements in the economic, cultural, and military fields to show that it is superior to the previous dynasty. 6. **Cultural and ideological reshaping**: By revising historical records, a new dynasty can promote new ideologies and social values and erase the past that is inconsistent with current policies and ideologies. 7. **The deeds of important figures**: A new dynasty may rewrite or cover up the deeds of figures who pose a threat to its rule or who have important positions in history, such as giving higher status to people loyal to the new regime and glorifying their contributions. These tamperings are usually achieved through the compilation of official history books, the destruction or rewriting of documents, and the control of oral history. Therefore, when studying history, it is necessary to consider these potential biases and be cautious about the information obtained from different sources.