Yang Guifei
In 733, fourteen-year-old Yang Yuhuan married Li Mao. Li Mao was the Prince of Shou and the son of Emperor Xuanzong and Consort Wu. Yang had the title of Princess of Shou. Consort Wu died in 737. So, Emperor Xuanzong was very sad by the death. Some time later,  Princess Yang came into Xuanzong's favor. So, the Emperor decided to take her as his wife. But Princess Yang was already the wife of his son. So, Emperor Xuanzong arranged her to become a Taoist nun. The name Taizhen was given to her to avoid bad fame from the people. He planned of making her his wife. Yang stayed for a some time as a Taoist nun in the palace itself. Emperor Xuanzong married his son with a new bride. After that, he made Yang his imperial consort.