Tian Xu
In 785, Emperor Dezong gave his sister Princess Jiacheng in marriage to Tian Xu. She did not bear him any sons, but his concubines bore him three sons — Tian Jihe (), Tian Jizhi (), and Tian Ji'an. Although Tian Ji'an was the youngest, Princess Jiacheng adopted him as her child, and therefore, eventually, he became designated as Tian Xu's heir.