Empress Cao was a Chinese empress consort of the Song dynasty, married to Emperor Renzong of Song. She served as regent of China during the illness of Renzong's successor Emperor Yingzong, from 1063 u

Emperor Renzong of Song, personal name Zhao Zhen, was the fourth emperor of the Northern Song dynasty of China. He reigned for about 41 years from 1022 to his death in 1063, making him the longest rei