The Guangxu Emperor was not the heir of the Tongzhi Emperor, and because the Tongzhi Emperor died at the age of 19, he did not have children.

The reason why Guangxu could succeed him was because the sons of the Daoguang Emperor were all the younger brothers of the Xianfeng Emperor and the uncles of the Tongzhi Emperor, and some of them had died early or passed on.
Among them, Prince Gong Yixuan was in a high position of power, and once he succeeded to the throne, it was not easy to control, and Cixi would lose the opportunity to bow to the government.
Therefore, Cixi decided to choose an heir among the Tongzhi Emperor's contemporaries, the eldest of whom was Prince Gong's son Zai Yi, who was 17 years old.
It was Cixi who was jealous of Prince Gong and excluded his son. Cixi took a fancy to Zai Xiang, the second son of Prince Yizhen of Alcohol. Yehenara was his mother and Cixi's sister.
Only 4 years old, it is also easy to control.
Therefore, the 4-year-old Zai Xiang became the Guangxu Emperor.
The Guangxu Emperor had no real power and had been subjected to Cixi. At that time, the great powers invaded, and the idea of changing the law was popular.
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In fact, the Guangxu Emperor supported the change of law. Despite this, he was unable to seize cixi's rights, and the restoration and reform law was quickly opposed and blocked. During the coup d'état of Cixi Wushu, Guangxu was imprisoned in Yingtai, and soldiers hunted down supporters of the Reform and Reform Law.
Finally, the Guangxu Emperor drank Cixi's yogurt and died violently. The next day, Cixi also died. According to the tai doctor, Guangxu's condition was originally very stable, but before he died, he rolled around in bed, with a black face and a yellow tongue. The cause of death feels suspicious.
The emperor would build a mausoleum before he died, but the Guangxu Emperor did not. His Qing Chongling Tomb was only seen after his death, which shows that the incident happened suddenly.
The Qing Chongling Tomb was built for 5 years, and Guangxu has not been able to enter the ground for safety, but Cixi has been buried for more than 4 years.
25 years later, tomb robbers stole the Qing Chongling Tombs. With axes and other tools, he chiseled a hole in Guangxu's coffin and stole all the precious burial items inside.
Due to the existence of the robbery cave, the Qing Chongling Tomb was blown by the wind and the sun, and it was seriously damaged. In order to rescue, in 1980, the cultural relics department Qing Chongling carried out excavations.
The underground palace was full of muddy water, and only the coffin of Empress Longyu next to Guangxu was bone. The feet of Guangxu's corpse were torn and destroyed by the tomb robbers, the shoes on the feet were gone, and the dragon-patterned clothes on his body became fragments.
What was disgusting was that the Guangxu Emperor's clothes had rotted and the debris around the corpse had been mixed together, like paste, and there was a musty smell.
But the miracle was that the purse around Empress Longyu's waist hid more than a hundred jewels, and the tomb robbers did not find it.
What was even more surprising was that the Guangxu Emperor's clenched hands originally had a conjoined green ring and a chicken blood stone, which were also not found by the tomb robbers.
Inside the Guangxu coffin, there are also thirteen layers of five-colored woven gold Sanskrit Dravidian satin and various colors of woven gold dragon colored satin, and the text is Tibetan, and sanskrit is well preserved. The three-tiered tent inside the coffin of Empress Longyu, purple woven gold is also Sanskrit. The two coffins are also surrounded by Sanskrit mantras.
Regarding the death of the Guangxu Emperor, experts say that he died of arsenic poisoning. Because the total amount of arsenic (arsenic cream) contained in his hair is as high as 210 mg, it has exceeded the lethal dose of a person.
The murderer, some people suspect that it is Yuan Shi, some people suspect that it is Li Lianying, and Cixi is more suspicious.
Because Cixi knew that her fate would soon be over, she was afraid that Guangxu would re-change the law after her death, and she was not at ease about this, so she decided to poison Guangxu first, so she could protect the feudal rule of the Qing Dynasty.
But everything is just speculation, and the facts remain to be studied.