Gao Lishi
However, in 737, after the death of Consort Wu, another favorite concubine of Xuanzong, Xuanzong was deeply depressed until Gao Lishi convinced him to try looking at Yang Yuhuan - the wife of prince Li Mao, Xuanzong's son with Consort Wu since her beauty was described as the most "irresistible". Being curious, Xuanzong ordered Yang Yuhuan to come and subsequently fell in love with her beauty. Since Yuhuan was still literally his daughter-in-law (as she was Li Mao's wife), emperor Xuanzong then stealthily arranged Yuhuan to become a Taoist nun, after a brief moment, Xuanzong eventually offered Yuhuan honorable title as Yang Guifei (with "Guifei" being the highest rank for imperial consorts) after bestowing his son Li Mao a new wife. Yuhuan became Xuanzong's most beloved consort as Xuanzong soon forgot about Consort Wu's death. His favors towards Consort Mei also waned.