Consort Dúgū, imperial consort rank Guìfēi (獨孤貴妃, personal name unknown) (died November 3, 775[1]), formally Empress Zhēnyì (貞懿皇后, literally "the virtuous and kind empress"), was an imperial consort of the Chinese Tang dynasty, during the reign of Emperor Daizong (Li Chu). She was Emperor Daizong's favorite concubine and, while she never became empress in her lifetime, she dominated inside the palace. He posthumously honored her as empress after her death in 775.