What is the name of the princess's husband?

Princess royal's husband's name is Xu.

In ancient China, Xu was the title of the son-in-law of the emperor, that is, the husband of the emperor's daughter. Xu is a special identity. Although she is the son-in-law of the emperor, she has no actual power, but only a certain etiquette status. In the Tang Dynasty, Xu's position was very high, because marriage could be used to strengthen political alliance, so Xu's election was also very important.