Who is Liu's ancestor?
First, from the surname of Qi, that is, after Emperor Yao, due to the seal in Liu (now Tangxian County, Hebei Province), the surname of Qi was established, and the descendants became the earliest Liu because of "taking the country as their surname". Liu Lei, a descendant of Yao, is good at training dragons. He tamed the dragon for the Xia emperor Kong Jia and was awarded the title of Emperor Dragon. The descendant of Liu Lei is the surname of Liu of Qi State.
Second, from the surname Qi. At the beginning of the Western Zhou Dynasty, King Wu collapsed as king, and Duke Zhou assisted in the administration of state affairs. Don Guo Jun (a descendant of Liu Lei) rebelled with Wu Geng, the son of Zhou Wang, and was killed by the Duke of Zhou. The Duke of Zhou changed the descendants of the Tang Dynasty to Du Yuan (now Ling Du, southwest of Shaanxi Province) to establish Du Guo, and the last monarch Du Bo was killed in Zhou Xuanwang. Du Bo's son Shu Duji fled to the State of Jin, and his son Dewey later served as a "judge" in the State of Jin. Later, people took his official position as their surname and called him a scholar. Later, the doctor's taxi club of the State of Jin (Du Lou's grandson) went to the State of Qin because of domestic unrest, and then returned to China, but one son stayed in the State of Qin, and the descendants who stayed in the State of Qin restored Liu's surname.
Third, from the surname Ji. There are two sources: one is Zhou's descendants. In the early years of the Western Zhou Dynasty, Zhou Chengwang established Wang Ji's son (uncle) in (now Liu Ju in the southwest of Yanshi, Henan Province, which is said to be Liu Lei's former residence, hence the name), and later people took the city as their surname, forming Liu's surname. On the other hand, in the Eastern Zhou Dynasty, Zhou Kuang appointed his youngest son to establish Liu Guo in Liuyi, known as Liu Kanggong. Later generations took the country as their surname, which is another source of Liu's surname. The two descendants of Liu and Ji have no obvious family background.
Originally, Liu was not a big family, but since Liu Bang established the Han Dynasty, which lasted for more than 300 years, the royal family produced a large number of descendants, which were enfeoffed all over China. At the same time, they gave many different surnames and even foreigners Liu's surname, forming a situation of "Liu everywhere", and Liu became a populous surname (although there were many ancient surnames such as Ji's surname and Yan's surname, there were many new clans now, but there was no unified Ji's surname and Yan's surname). Therefore, many modern Liu surnames regard Emperor Gaozu as their ancestors and even worship the "Twenty-four Emperors" directly. But this is not an accurate and objective understanding, because even if a surname Liu is indeed a descendant of Emperor Gaozu, he cannot be a descendant of all 24 emperors, because these 24 emperors are not all immediate relatives of their father and son. For example, Liu Ying and Heng are brothers, both sons of Liu Bang. So one can't be descended from Liu Ying and Liu Heng. This is the first branch. There have been many similar situations since then. Generally speaking, the Eastern Han Dynasty is not a direct descendant of the Western Han Dynasty. Because Liu Xiu's ancestor was Liu Fa, the illegitimate child of Emperor Jing of Han Dynasty, that is to say, Liu Fa was the younger brother of Liu Che, the Emperor Wu of Han Dynasty and the later Western Han Dynasty had no direct relationship with the Eastern Han Dynasty. Therefore, the descendants of an emperor in the Eastern Han Dynasty and his ancestors in the Western Han Dynasty were only Liu Bang, Liu Heng and Liu Qi. The descendants of Emperor Wudi are not directly related to all the emperors in the Eastern Han Dynasty. And so on, it is absurd to regard the 24 th Imperial Capital of the Han Dynasty as the ancestor of someone named Liu. Liu Bang was the only ancestor of all descendants of the royal family in the Han Dynasty.