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From the Yongzheng period, the discussion about Yongzheng's succession was endless. Although there is no conclusion on the legitimacy of the throne in the history circle, the popular theory of "ten changes" is not valid, because the existing Kangxi testamentary edict in the archives of Liaoning Province was drafted and promulgated after Yongzheng ascended the throne, not the original Kangxi testamentary edict, so it can't explain the problem.
Some scholars who advocate the theory of usurpation think that Kangxi died too suddenly and left no legacy, while Yongzheng and Longkeduo conspired to seize the opportunity; Some people think that Kangxi set up two deposed princes before his death, and it was frustrating to oppose Chu Jun. It was not until his deathbed that he chose the fourteenth son of the emperor as Chu Jun.
According to orthodox succession scholars, Yongzheng's accession to the throne is justified if there is no tangible evidence to prove that other princes belong to Kangxi. Moreover, the word "yellow" is usually added to imperial edicts, for example, it is said that the fourth son is located in Huang, so it is unfounded to change "ten" to "jade".
As for the cause of Yongzheng's death, the historical records are very simple, only that Yongzheng was seriously ill in the palace of Yuanmingyuan the day before and critically ill the next afternoon. He called the minister urgently and died that night. What caused the death of Yongzheng is not recorded in historical materials. Zhang's personal records made him "terrified" when Yongzheng was bleeding.
The reason for Yongzheng's sudden death was not recorded in official books, which naturally aroused people's doubts. In addition, there were many legends and comments about him at that time, which easily aroused people's doubts, so various statements were produced.