Emperor Gaozong of TangEmperor Gaozong of Tang (21 July 628 – 27 December 683), personal name Li Zhi, was the third emperor of the Tang dynasty in China, ruling from 649 to 683; after January 665, he handed power over the empire to his second wife Empress Wu (the future Wu Zetian), and her decrees were carried out with greater force than the decrees of Emperor Gaozong's. Emperor Gaozong was the youngest son of Emperor Taizong and Empress Zhangsun; his elder brothers were Li Chengqian and Li Tai.
Emperor Ruizong of TangEmperor 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 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.
Emperor Xuanzong of TangEmperor Xuanzong of Tang (xuan3.zong1; 8 September 685 – 3 May 762), personal name Li Longji, was the seventh emperor of the Tang dynasty in China, reigning from 712 to 756 CE. His reign of 44 years was the longest during the Tang dynasty. Through two palace coups, he seized the throne and inherited an empire still in its golden age. He was initially assisted by capable chancellors like Yao Chong, Song Jing and Zhang Yue who were already serving as government officials before Xuanzong ascended the throne.
Wu ZetianWu Zetian (17 February 624 – 16 December 705), personal name Wu Zhao, was the first and only female emperor in Chinese history, and de facto ruler of the Tang dynasty from 665 to 705, ruling first through others and then (from 690) in her own right. From 665 to 690, she was first empress consort of the Tang dynasty (as wife of the Emperor Gaozong) and then, after his death, empress dowager (ruling through her sons Emperors Zhongzong and Ruizong).
Chinese sovereignThe Chinese sovereign was the ruler of a particular monarchical regime in the historical periods of ancient China and imperial China. Sovereigns ruling the same regime, and descended from the same paternal line, constituted a dynasty. Several titles and naming schemes have been used throughout Chinese history. Emperor of China The characters Huang (皇 huáng "august (ruler)") and Di (帝 dì "divine ruler") had been used separately and never consecutively (see Three August Ones and Five Emperors).
Imperial examinationThe imperial examination (; lit. "subject recommendation") was a civil service examination system in Imperial China administered for the purpose of selecting candidates for the state bureaucracy. The concept of choosing bureaucrats by merit rather than by birth started early in Chinese history, but using written examinations as a tool of selection started in earnest during the Sui dynasty (581–618) then into the Tang dynasty of 618–907.