In Chinese history, there was an emperor who ascended the throne just over 100 days after his birth, becoming the youngest emperor; he died after 220 days on the throne, becoming the shortest-lived emperor, only one year old. He was Liu Long, the fifth emperor of the Eastern Han Dynasty.
Liu Long was the son of Emperor Liu Zhao of the Han Dynasty and was sent to the people for upbringing just after birth. When Emperor Han and Emperor were alive, although they gave birth to many princes, none of them were able to grow up safely, and Emperor Han and Emperor believed that eunuchs and foreign relatives were secretly plotting to kill his son, so he later sent the reborn princes to be raised outside the palace.

In 105 AD, when Emperor He of Han died, there were only two sons left, the eldest son, Liu Sheng, who was only 8 years old, and the younger son, Liu Long, who was just over 100 days old and was still in infancy. According to the regulations of the time, the throne should be inherited by the eldest son, but the eldest son Liu Sheng was weak and sickly, and Empress Deng Sui thought that he was too weak to inherit the throne, so he took the emperor's second son Liu Long from the people back to the palace and inherited the throne.
As for why Empress Deng did not let her eldest son Liu Sheng take the throne, there is also a saying in the folk that it is because Empress Deng Sui wants to take power and control the government, although the eldest son is only 8 years old, but there is still no baby of a few months to rest assured, after all, such a small child, do not know anything, can only be managed by Deng Sui. When Liu Long ascended the throne, He was taken over by Empress Deng in her arms, becoming the youngest prince in Chinese history to inherit the throne. Deng Sui became the most honorable person, and Empress Deng listened to the government and actually controlled the power of the Eastern Han Dynasty.
In fact, Deng Sui was also a famous female politician of the Eastern Han Dynasty, entering the palace at the age of 15 and being crowned Empress Hexi at the age of 22. When her husband Liu Zhao died, he was only 26 years old and his children were young, and at a time of national crisis, Deng Sui, who was only 25 years old, stepped forward to save his family and country and came to the court. After Deng Sui ascended to the throne, he adopted a series of powerful reform measures in response to some shortcomings of the Eastern Han Dynasty, and was also very frugal and persuaded the peasants, advocating that the governance of the country should be based on indoctrination and supplemented by punishment.
In May 106, she issued an edict granting amnesty to the world and inheriting the tradition of the Guangwu Emperor to rule the country with "judo". As a woman, she knows a lot about the suffering of the palace maid and is very sympathetic. From the founding of the Eastern Han Dynasty to the Liu Long period, for more than eighty years, countless women have entered the palace one after another, and their lives have been wasted in this palace wall, while many people in the folk cannot marry wives, resulting in a situation of "internal resentment of women, outside there are husbands", but also increased the financial burden of the imperial court.
In September 106, Liu Long, who had only been emperor for 220 days, died quietly in his infancy, at the age of one. He died of infatuation, so he was given the title of "Emperor Xiaoyi" and was buried in Kangling after his death. He became the only monarch in Chinese history to complete his imperial career before he was less than one year old.