Gao Lishi
Historians said that Emperor Xuanzong forced tens of thousands of beautiful women to live in his palace to please him, more than many other Tang emperors. And he did not allow many to be set free even when they were old. As Emperor Xuanzong turned his attention to pleasure-seeking with his favorite concubine Yang Guifei and her family, he paid less and less attention to the running of his empire, and much of his power fell into the hands of the corrupt Li Linfu (who was succeeded by Lady Yang's dissolute cousin Yang Guozhong) and the eunuch Gao Lishi.