당 고종
Emperor Zhongzong was the son of Emperor Gaozong of Tang and Empress Wu (later known as Wu Zetian), and during the reign of his father the real power was completely controlled by Empress Wu. He succeeded his father in 684, But as emperor, he has very much little ruling and true power, and all affairs and power remained in the hands of his mother, Empress Dowager Wu. His mother, however, deposed him less than two months later in favor of his younger brother Emperor Ruizong. The former emperor, demoted to a princely rank, was sent in exile in the provinces and placed under house arrest. Six years later, Emperor Ruizong in turn relinquished the throne to his mother and Empress Dowager Wu officially proclaimed herself empress regnant, while Emperor Ruizong was made crown prince.