Yang Guifei
In 755, An finally rebelled. He marched his armies toward the capital. The emperor wanted to control the public. Emperor Xuanzong thought of passing the throne to his crown prince, Li Heng. Yang Guozhong was not on having good relationship with the prince. So, he feared this development. He requested Consort Yang and her sisters, the Ladies of Han, Guo, and Qin, to speak against it. They did so. So, Emperor Xuanzong did not leave the throne.