What image a person will leave in history is sometimes a very accidental thing. Even if Jia Gongyan pats his head, he probably won't know that in a thousand years, he will be regarded as the earliest discoverer of fingerprint recognition technology.
For most people, the name Jia Gongyan is quite unfamiliar, but if we are interested in Confucianism, especially Zhou Li, we will know that he can be called the number one person in this field. This Confucian student of the Tang Dynasty used his research on Zhou rituals to become a Ph. The rank of this official post was not high at the time, but the work it assumed was very important and noble to the Confucianists. He will not only participate in the Confucian Classics teaching in the Imperial College, but also participate in the interpretation of Confucian classics. There are two classic commentaries edited by Jia Gongyan-"Zhou Li Yi Shu" and "Yi Li Yi Shu", both of which are now important references for studying Zhou Li.