How Did the Yongzheng Emperor Really Die and Why Did the Qing Dynasty Keep Covering It Up

The Death of the Yongzheng Emperor: History's Greatest Cover-Up

On the 23rd day of the eighth lunar month in the 13th year of Yongzheng's reign—October 8, 1735 in the Western calendar—the Qing emperor Aisingioro Yinzhen collapsed and died in the Old Summer Palace at the age of 58. From illness to death took merely two or three days. This iron-fisted emperor, famous for his diligent governance and reviewing memorials until deep into the night, suddenly departed from this world. What made the matter even more peculiar was that the official Qing court was extremely secretive about the cause of his death. The Veritable Records of the Yongzheng Emperor and the Records of Daily Activities contained only a few sparse lines, dismissing the matter in passing. This unusual silence transformed the death of Yongzheng into one of the greatest unsolved mysteries of the Qing dynasty.

Multiple Suspicions in Official Records

According to the Veritable Records of the Yongzheng Emperor, on the 21st day of the eighth month, Yongzheng was still handling state affairs normally, receiving ministers and reviewing memorials. On the 22nd, he suddenly felt unwell, yet still persisted in dealing with several urgent memorials. In the early morning of the 23rd, his condition rapidly deteriorated, and he passed away that same day.

This account itself is filled with inconsistencies. How could a man who was working normally yesterday suddenly die within two days? According to protocol, when a Qing emperor passed away, records should have documented the course of his illness, medications used, and diagnoses from imperial physicians. Yet Yongzheng's death records contained absolutely none of this information. Even more strangely, shortly after Yongzheng's death, the newly enthroned Kangxi's successor, the Qianlong Emperor, issued a cryptic edict expelling all the Daoists from the palace, including Zhang Taoxu and Wang Dinggan, and strictly warned them not to divulge palace secrets.

If Yongzheng had died a normal death from illness, why would Daoists need to be expelled? Why would they need to be silenced?

Heavy Metal Poisoning from Elixirs: The Most Credible Cause of Death

The most mainstream view in modern historical circles is that Yongzheng died from heavy metal poisoning caused by long-term consumption of alchemical elixirs.

Yongzheng's obsession with Daoist alchemy far exceeded ordinary imagination. According to Qing palace archives, starting from the eighth year of Yongzheng's reign (1730), he established special elixir furnace workshops within the Old Summer Palace and successively summoned numerous Daoists to produce elixirs for him. The palace Activity Records contained detailed purchase lists of materials used for alchemy: black lead, mercury, sulfur, cinnabar, and orpiment—all extremely toxic substances containing heavy metals.

Between the 12th and 13th years of Yongzheng's reign alone, the Imperial Workshops procured vast quantities of black lead and mercury for alchemy. According to Daoist alchemical theory, lead and mercury, after being processed through "nine transformations," could be refined into "elixir of immortality," which when consumed could extend life and grant immortality. From the perspective of modern medicine, however, these so-called immortal pills were merely mixtures of various metal oxides whose long-term consumption inevitably caused chronic poisoning.

Typical symptoms of lead poisoning include abdominal pain, vomiting, mental confusion, and organ failure; mercury poisoning damages the central nervous system and kidneys. In his imperial rescripts during the final two years, Yongzheng frequently mentioned that his "spirit was depleted," his "head was dizzy," and his "abdomen was uncomfortable"—symptoms that precisely matched those of chronic heavy metal poisoning. The acute onset and sudden death in the final two or three days likely resulted from ingesting an unusually high dose of elixir, triggering acute poisoning.

The Assassination by Lü Sijniang: The Most Bizarre Popular Legend

The version most widely circulated in folk tradition is the "assassination by Lü Sijniang." The story goes like this: During the Yongzheng era, a great literary inquisition was launched. A scholar from Hunan named Lü Liuliang faced execution and posthumous desecration for passages with anti-Qing sentiments in his writings, and his entire family was executed or exiled. Lü Liuliang's granddaughter Lü Sijniang miraculously escaped, studied martial arts under a master for many years, and developed extraordinary kung fu skills. Later, she infiltrated the palace, and one night sneaked into Yongzheng's sleeping quarters. With one swift stroke of her blade, she severed the emperor's head from his body and fled the palace by scaling roofs and walls.

This account became widely circulated because it was allegedly said that a golden head was buried with Yongzheng in his tomb, because his real head had been taken by Lü Sijniang. In the 1980s, archaeologists conducted surveys of Yongzheng's Tailing mausoleum, but they did not formally excavate it, so the "golden head" claim remains neither confirmed nor refuted to this day.

However, from a practical standpoint, this story is almost certainly false. The security system within the imperial palace was extremely strict, and the Old Summer Palace had multiple layers of guards. For a single person to penetrate through the protection of guards, eunuchs, and palace maids to reach the emperor's sleeping quarters and escape unscathed would have been virtually impossible in reality. More importantly, if Yongzheng had truly been assassinated, the court would not have simply expelled a few Daoists. It would certainly have launched a massive manhunt and purged the martial arts underworld.

Murder by Palace Maids or Eunuchs: Another Cloud of Suspicion

There is yet another theory that Yongzheng was strangled by a palace maid or eunuch. This theory draws inspiration from the "Renyin Palace Incident" of the Ming dynasty, when the Jiajing Emperor narrowly escaped strangulation by palace maids. Those supporting this theory argue that Yongzheng's temperament was violent and tyrannical, and his harsh treatment of subordinates might have driven certain palace maids or eunuchs to take desperate action.

This explanation similarly lacks direct evidence. Although Yongzheng showed no mercy to ministers and brothers, the palace archives contain no specific records of him mistreating eunuchs or maids. Furthermore, strangling the emperor was such a grave matter that it would inevitably trigger serious investigation and punishment afterward. However, there are no records of any palace maids or eunuchs being collectively punished following Yongzheng's death.

Why Did the Qing Dynasty Conceal the Truth?

Understanding the cause of death raises a more interesting question: why would the Qing dynasty conceal it?

The answer is actually quite straightforward. If Yongzheng died from elixir poisoning, it meant that the mighty Qing emperor had indulged in Daoist magical practices and consumed toxic elixirs—something considered profoundly undignified by Confucian orthodox standards. The Qing ruled through Confucianism, and the emperor should embody the image of a rational, enlightened, and virtuous sage devoted to the world, not an alchemist pursuing immortality.

The situation was even more problematic: Before his accession, Yongzheng had already earned a reputation for intelligence and pragmatism. During his reign, he implemented major reforms including the consolidation of the poll tax into the land tax, regularization of surcharges, and the transformation of native chieftain territories into direct imperial administration. He was one of the rare pragmatic reformers of the Qing dynasty. If it were openly acknowledged that he died from elixir poisoning, it would not only damage the imperial family's dignity but might also undermine the legitimacy of the reforms he implemented during his reign.

Qianlong's handling after ascending to the throne was remarkably sophisticated: he quietly expelled the Daoists and dismantled the alchemy furnaces, then glossed over the cause of death in a single line in the Veritable Records. This protected his father's reputation while eliminating potential problems. As for the various folk legends, they actually served to distract public attention. The more people enjoyed discussing Lü Sijniang's assassin legend, the less likely they were to inquire into heavy metal poisoning—the true answer.

Yongzheng's Final Hours

Synthesizing various historical records, the final scene of Yongzheng's life probably looked something like this:

This 58-year-old emperor had been consuming alchemical elixirs continuously for five years, his body already ravaged by heavy metals. Yet he still worked every day until late into the night, inscribing his famous vermillion rescripts on memorials: "I am simply such a man, with such a temperament, such an emperor." He may have genuinely believed the elixir would grant him a few more years to continue implementing his unfinished reforms.

However, in his final two days, a single dose of elixir became the final straw that broke the camel's back. Acute poisoning struck, his liver and kidneys failed, and this emperor who had reigned for only thirteen years yet profoundly transformed China, hurriedly departed this life in one of the halls of the Old Summer Palace.

Yongzheng's death was essentially the fatal mistake of an extremely rational man in pursuit of eternity. He could employ cold-blooded tactics to reform the bureaucracy and implement new policies, yet he could not resist "immortality"—humanity's most ancient temptation. The three-hundred-year concealment by the Qing dynasty was nothing more than draping a cloth of shame over this empire's most unwelcome truth.