Wu Chengsi, nephew of Chinese sovereign Wu Zetian

Wu Chengsi, courtesy name Fengxian, formally Prince Xuan of Wei (魏宣王), was a nephew of the Chinese sovereign Wu Zetian and an imperial prince of the Wu Zhou dynasty. He participated in her planning in taking the throne and had wanted to become crown prince after she claimed the throne in 690, but his attempts were repeatedly rebuffed, and after she showed her intent to eventually return the throne to her son Li Zhe by recalling Li Zhe from exile in 698, Wu Chengsi died in disappointment.

The history of China spans several millennia across a wide geographical area. Each region now considered part of the Chinese world has experienced periods of unity, fracture, prosperity, and strife. Chinese civilization first emerged in the Yellow River valley, which along with the Yangtze basin constitutes the geographic core of the Chinese cultural sphere. China maintains a rich diversity of ethnic and linguistic people groups. The traditional lens for viewing Chinese history is the dynastic cycle: imperial dynasties rise and fall, and are ascribed certain achievements. This lens also tends to assume Chinese civilization can be traced as an unbroken thread many thousands of years into the past, making it one of the cradles of civilization. At various times, states representative of a dominant Chinese culture have directly controlled areas stretching as far west as the Tian Shan, the Tarim Basin, and the Himalayas, as far north as the Sayan Mountains, and as far south as the delta of the Red River.

Wu Zetian, personal name Wu Zhao, was empress of China from 660 to 705, ruling first through others and later in her own right. She ruled as empress through her husband Emperor Gaozong and later as empress dowager through her sons Emperors Zhongzong and Ruizong, from 660 to 690. She subsequently founded and ruled as empress regnant of the (Wu) Zhou dynasty from 16 October 690 to 21 February 705. She was the only female sovereign in the history of China who is widely regarded as legitimate. During her 45-year reign, China grew larger, its culture and economy were revitalized, and corruption in the court was reduced. She was eventually removed from power during a coup and died a few months later.