Emperor Zhongzong of Tang in the context of "Yao Chong"

Zhou, known in historiography as the Wu Zhou (Chinese: 武周) and Southern Zhou (Chinese: 南周), was a short-lived Chinese imperial dynasty that existed between 690 and 705. The dynasty consisted of the reign of one empress regnant, Wu Zhao (Wu Zetian), who usurped the throne of her son, the Emperor Ruizong of Tang, in 690. The dynasty lasted until another one of Wu Zhao's sons, the Emperor Zhongzong of Tang, was restored to the throne in the Shenlong Coup [zh] in 705, marking the restoration of the Tang dynasty. Historians generally regard the Wu Zhou as an interregnum of the Tang dynasty.

Wu named her dynasty after the ancient Zhou dynasty, from whom she believed herself to be descended.

Empress Zetian (624 – 16 December 705), commonly known as Wu Zetian, personal name Wu Zhao, was the empress regnant (huangdi, 皇帝) and only ruler of the (Wu) Zhou dynasty from 690 to 705. She had previously held power as the second wife and empress consort of Emperor Gaozong of the Tang dynasty from 660 to 683 and as empress dowager during the reigns of her sons Emperors Zhongzong and Ruizong of Tang between 683 and 690, holding de facto power during these periods. She was the only female sovereign in the history of China who is widely regarded as legitimate. Modern scholarship has re-examined Wu Zetian's rule beyond traditional portrayals of manipulation and cruelty. Recent studies highlight her administrative reforms, expansions of the civil-service examination system, and support of Buddhist symbolism as instruments of governance and legitimacy. During her 45 year tenure, China grew larger, its culture and economy were revitalized, and corruption in the court was reduced. She was eventually removed from power during the Shenlong Coup [zh] and died a few months later.

In early life, Empress Wu was a concubine of Emperor Taizong. After his death, she married his ninth son and successor, Emperor Gaozong, officially becoming Gaozong's empress, the highest-ranking of his consorts, in 655. Empress Wu held considerable political power even before becoming empress, and began to control the court after her appointment. After Gaozong's debilitating stroke in 660, she became administrator of the court, a position with similar authority to the emperor's, until 683. History records that she "was at the helm of the country for long years, her power no different from that of the emperor". On Emperor Gaozong's death in 683, rather than entering retirement, and not interfering in the government, Empress Wu broke with tradition and took acquisition of complete power, refusing to allow either of her sons to rule. She took the throne in 690 by officially changing the name of the dynasty from Tang to Zhou, changing the name of the imperial family from Li to Wu, and holding a formal ceremony to crown herself as emperor.

The Dunhuang map or Dunhuang Star map is among the earliest known graphical depictions of the night sky in ancient Chinese astronomy, dating to the Tang dynasty (618–907). Prior to the discovery of this map, much of the star-related information recorded in early Chinese texts had been subject to speculations. The map provides visual corroboration of those textual records and forms part of a scroll that includes a series of illustrations found among the Dunhuang manuscripts. It is currently regarded as the world's oldest known complete star atlas.

The manuscript containing the star map was discovered in the early 20th century in the Mogao Caves and was taken along with hundreds of other manuscripts during a British expedition to Dunhuang. The scroll containing the Dunhuang map is currently held in the British Library.

Li Chongrun (Chinese: 李重潤; pinyin: Lǐ Chóngrùn; c.2 March 682 – October 8, 701), né Li Chongzhao (Chinese: 李重照; pinyin: Lǐ Chóngzhào), formally Crown Prince Yide (Chinese: 懿德太子; pinyin: Yìdé Tàizǐ ), was an imperial prince of the Tang dynasty and Wu Zetian's Zhou dynasty. He was the only son of Emperor Zhongzong (Li Zhe/Li Xian) and Emperor Zhongzong's second wife Empress Wei. In 701, he offended his grandmother Wu Zetian by discussing Wu Zetian's lovers Zhang Yizhi and Zhang Changzong with his sister Li Xianhui the Lady Yongtai and her husband Wu Yanji (武延基) the Prince of Wei, and he, along with Li Xianhui and Wu Yanji, were forced to commit suicide. He was posthumously honored as crown prince after his father Emperor Zhongzong was restored to the throne in 705 and in 706, Emperor Zhongzong provided Li Chongrun with an honorable burial by interring his remains at the Qianling Mausoleum.

Emperor Ruizong of Tang (22 June 662 – 13 July 716), personal name Li Dan, also known at times during his life as Li Xulun, Li Lun, Wu Lun, and Wu Dan, was the fifth and ninth emperor of the Chinese Tang dynasty. He was the eighth son of Emperor Gaozong and the fourth son of Emperor Gaozong's second wife Empress Wu. He was wholly a figurehead during his first reign when he was controlled by his mother, and he was the titular and puppet ruler of the Tang Empire from 684 to 690. During his second reign after his mother's death, significant power and influence was exercised by his sister Princess Taiping.

In February 684, Li Dan's mother Empress Wu demoted his older brother Emperor Zhongzong (Li Xian) who had attempted to rule free of his mother and named him emperor (as Emperor Ruizong). Emperor Ruizong, however, was a hollow figurehead under control of his mother and had no real power, even nominally, his name was not included in the issued documents or orders. He was not even able to move freely around his private residence, let alone attend to governmental affairs. From then onwards, the Tang dynasty existed only in name and Empress Dowager Wu ruled China for over six years as quasi-emperor. Empress Wu, was comfortable about the empire being entirely under her control, decided finally to seize the throne, so in October 690 Emperor Ruizong ceded the imperial throne to his mother, who installed herself as empress regnant – the only woman in Chinese history ever to rule with this title. She issued a decree that ended the Tang dynasty and founded the Zhou dynasty. Emperor Ruizong was reduced to the position of crown prince, with the unconventional title of Huangsi (皇嗣, "imperial successor"). In the following years, Empress Wu's nephews Wu Chengsi and Wu Sansi tried to have one of them named heir to the throne, but Wu Zetian resisted these calls. Eventually, in October 698, faced with foreign invasion and dissatisfaction at home, Empress Wu accepted the suggestion of the chancellor Di Renjie and recalled the exiled Li Xian to the capital Luoyang. Soon, Li Dan offered to yield the position of crown prince to his elder brother, and Li Xian became crown prince instead.

Empress Wei (Chinese: 韋皇后; pinyin: Wéi Huánghòu; personal name unknown; died July 21, 710) was an empress consort of the Chinese Tang dynasty. She was the second wife of Emperor Zhongzong, who reigned twice, and during his second reign, she tried to emulate the example of her mother-in-law Wu Zetian and seize power. She was de facto in charge of the governmental affairs during her husband's reign, though she was not formally regent. Emperor Zhongzong's death in 710 — a death traditionally believed to be a poisoning she carried out together with her daughter Li Guo'er the Princess Anle — made her the empress dowager, and she took formal power as regent de jure during the minority of Emperor Shang of Tang. After a reign of seventeen days as regent, she was overthrown and killed in a coup led by Emperor Zhongzong's nephew Li Longji (the later Emperor Xuanzong) and Emperor Zhongzong's sister Princess Taiping.

Li Xian (Chinese: 李賢; pinyin: Lǐ Xián; Wade–Giles: Li Hsien) (29 January 655 – 13 March 684), courtesy name Mingyun (Chinese: 明允; pinyin: Míngyǔn), formally Crown Prince Zhanghuai (Chinese: 章懷太子; pinyin: Zhānghuái Tàizǐ), named Li De (Chinese: 李德; pinyin: Lǐ Dé) from 675 to 680, was a crown prince of the Chinese Tang dynasty. He was the sixth son of Emperor Gaozong, and the second son of his second wife Empress Wu (later known as Wu Zetian). He was known for writing commentaries for the Book of Later Han, the official history of the Eastern Han dynasty. He became crown prince in 675 after his older brother Li Hong's death (which traditional historians believed to be a poisoning by Empress Wu), but soon fell out of favor and generosity with Empress Wu herself and that's what caused his downfall. In 680, Empress Wu had her associates accuse Li Xian of treason, and he was demoted to commoner rank and exiled. In 684, after Emperor Gaozong's death, Empress Wu, then empress dowager, had her associate Qiu Shenji (丘神勣) visit Li Xian to force him to commit suicide.

In 706, his younger brother Emperor Zhongzong provided Li Xian with an honorable burial by interring his remains at the Qianling Mausoleum.