There are twenty-one Hejian kings in history, and they were in different periods: Han Dynasty, Western Jin Dynasty, Yuan Dynasty, and Northern Qi Dynasty. Among them, there are fifteen people with the surname Liu, one with the surname Sima, two with the surname Gao, and three with the surname Boerzhijin. The most famous among them is Liu De, the king of Hejian in the Han Dynasty. He was the first senior figure to rescue ancient books in the Han Dynasty. His academy was the ancestor of the research institutions in the Han Dynasty. Secondly, he was the one who defeated many royal families in the Eight Kings Rebellion of the Jin Dynasty. The dark horse——Sima Yong, the king of Hejian. Among the kings of Hejian in the past dynasties, the main positive figure in history is Liu De, the king of Hejian in the Han Dynasty.