In December of the first year of Yuanxing, Emperor Han and Emperor Di died in the front hall. At this time, Liu Longgang was born 100 days. According to tradition, Liu Sheng, the eldest son of Han and the emperor, should inherit the throne, but Liu Sheng suffered from a strange disease since childhood and has not recovered for many years. Liu Long was made emperor for the Han Dynasty. Deng Sui was promoted to Empress Dowager, and Empress Dowager Deng Sui listened to the government.
19 1 1 In August of the first year of Yanping, Empress Deng Sui commanded that Liu Long, who had been emperor for only 220 days, quietly passed away at the age of one, so he went to posthumous title as a "filial piety" and was buried in Kangling after his death. Emperor Ai of Han Dynasty is the youngest and shortest-lived emperor in China. He is called "August Emperor" or "Hundred Days Emperor" by historians.
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The harem of Han and Emperor was restless, and most of the newly born princes died young. When Emperor Wu of the Han Dynasty was in his twenties, his eldest son Liu Sheng was the only one. So in order to avoid the loss of royal blood again, when Emperor Liu Long was born, Emperor Han and Emperor He ordered him to be sent to a private place for raising, so as to enrich the children of the harem.
Liu Zhao, the emperor of the Han Dynasty, died at a young age, leaving his last life in front of him and connecting Liu Long to the palace as the next emperor. So, Queen Deng secretly ordered the emperor's second son, Liu Long, to be taken to the palace. At the same time, the testamentary edict of Han and Emperor was made public and a conferring ceremony was held. After the death of Emperor Gaozu Xueyuan, two royal relatives were shortlisted as the heirs of Emperor Gaozu Xueyuan. One is Liu Sheng, the eldest son of Emperor Wu of the Han Dynasty, and the other is Liu Hu of Zhang Han.
When deciding who will be the next heir, most ministers in North Korea supported granting Liu Sheng, the eldest son of Han and the emperor, as the first heir of the emperor. However, Empress Dowager Deng insisted that another younger son, Liu Hu, should be the next emperor, and inherit the imperial business of Emperor Wu before his death, which was called Emperor Liu Hu in history.
References:
Baidu Encyclopedia-Liu Long