According to Li Dan's resume website, Princess Yu Zhen is the ninth daughter of Li Dan, Tang Ruizong. Princess Yu Zhen, Shi Liren, word, number "Holding Ying", dharma number supreme truth, Longxi adult ceremony. Princess Tang, the ninth daughter of Tang Ruizong Li Dan, Li Longji and Princess Jin Xian of Tang Xuanzong had a half-sister, and her mother was Dou Defai.