Kong Jia, the fourteenth king of the Xia dynasty, was given a male and a female dragon as a reward for his obedience to the god of heaven; yet he could not train them, so he hired a dragon-trainer named Liu Lei (劉累), who had learned how to train dragons from Huanlong.

Liu Lei was a descendant of Emperor Yao, and won the admiration of King Kong Jia for his skill at dragon-rearing.

One day, the female dragon died unexpectedly, so Liu Lei secretly chopped her up, cooked her meat, and served it to the king, who loved it so much that he demanded Liu Lei to serve him the same meal again.

Liu was the ruling family of the Han dynasty, one of the most prosperous and influential empires in Chinese history.

Later, Emperor Liu Che helped expand the Han dynasty even further, ushering in a golden age for China.

The Han dynasty lasted 400 years, making it one of the longest-lasting Chinese empires in history.