Whether an emperor's energy is strong, if there are enough women, it depends on her childbearing records. Newly built kingdoms, busy government affairs, or major changes have often affected the birth of children.
In history, emperors with many sons and daughters are not in the minority, such as Tang Xuanzong Li Longji and Song Huizong Zhao Yan. They have a lot of women, and they are targeted, but they can't do it within a year. In contrast, Tang Gaozu Li Yuan set a record despite having been in office for a short time, with five children in one year.
Prior to Li Yuanju, there were fewer women and fewer sons, including Li Jiancheng, Li Shimin, Li Xuanba, Li Yuanji, and Li Zhiyun. Because Li Xuanba died early, Li Zhiyun was involved in Li Yuan's affairs and died, so Li Yuan said that there were only three sons left before the emperor. In the first year of Wu De (618), Li Yuan, who became the emperor, added another son, the sixth son, Li Yuanjing. Judging from the death of Li Yuanjing's mother Mo Guizhen in November due to birth sickness, Li Yuanjing should have been born shortly before.
The first year of Wu De was the year of Sui and Tang Xing. This year, Li Yuan was in his fifties, coupled with the establishment of a new dynasty, and the state was busy. It should be relatively tired, but Li Yuan was not idle in the harem. Earlier, Li Yuan "passed the emperor's palace garden, let's stop, the maid of the palace returned relatives" ("Old Tang Book · High Ancestry"), but most of the beauties gathered in the palace of the Sui Dynasty were accepted by Li Tang. Honors and nobles, Li Yuan stayed a lot.
Power is the best Viagra. Li Yuan is called emperor by his ministers. He first ascended the treasure and became the owner. He jumped to the top of power. The joy of success made him forget that he was fifty-four years old. Body, gossiping in bed, fighting in bed. The author said this, not babble, but based on facts. Because the following year, the second year of Wu De (619), Li Yuan added five sons in one breath, and his daughter was not counted.
The five sons of Li Yuan, seventh son Li Yuanchang, eighth son Li Yuanheng, ninth son Li Yuanfang, tenth son Li Yuanli, and eleventh son Li Yuanjia, were born in the same year from the seventh to the eleventh.
Regarding the year of birth and death of Li Yuanchang, "Old Tang Book Gaozu Twenty-two Sons" records, "The Han King Yuanchang, the seventh son of Gaozu also .... (Zhen Guan) Seventeen years, the incident, Taizong ... Nai Yuanchang Self-destruction at home ", without specifying his birth year. According to "The Tang Dynasty Yuanchang Epitaph", "Yuanchang, ... Zhenguan Seventeen Years (643) died on April 6th in private, and there are five in spring and autumn." Li Yuanchang was born in Wude. Two years (619).