These three kings were the founding emperors of Xia, Shang and Zhou Dynasties, namely Dayu, Shang Tang, Zhou Wuwang and Zhou Wenwang. For example, "Biography of Zheng Yi in the Old Tang Dynasty": "There are loyal ministers to replace them and restore them. Our country should undertake the five games, the three kings will be unified, and the cotton area will drink and turn to benevolence. "
The Three Kings are often called "Five Emperors and Three Kings" together with the Five Emperors, "Two Emperors and Three Kings" together with Yao Shun and "Three Emperors, Five Emperors and Three Kings" together with Huang San. For example, Li Si's book on remonstrance and expulsion: "It is precisely because Mount Tai does not allow scholars to soil that it can become great;" Rivers and seas do not choose trickle, so they can be deep; The king is not only popular, so he can understand his virtue. There is no good place in the old land, no foreign country for the people, beautiful seasons and blessings for ghosts and gods. The reason why these five emperors and three kings are invincible is also. "Bai Juyi's" Nine Books with the Same Yuan ":"Those two emperors and three kings who go straight and bow to their knees think that this is a big handle, and they must think that this is a big sinus. "The Book of Rites says:" Full Zen is called holiness. The five emperors meditate, and their grace is unique. The three kings meditated on Fu Liang for a long time, and the father had no son to follow.