Xu Jingzong
Xu Jingzong (592 – September 20, 672), courtesy name Yanzu, posthumously known as Duke Gong of Gaoyang, was a Chinese cartographer, historian, and politician who served as a chancellor in the Tang dynasty. Allied with Emperor Gaozong's powerful wife, Empress Wu (later known as Wu Zetian), Xu Jingzong was exceedingly powerful and effective throughout most of Gaozong's reign. By order of Empress Wu, he played a major role in the elimination of the chancellors opposed to her, between years 657 to 659 and 665. Early life Xu Jingzong was born in 592, during the reign of Emperor Wen in the Sui dynasty. His ancestors had served as officials of the Southern dynasties during the Southern and Northern dynasties period for generations and claimed to be originally from Gaoyang Commandery (, roughly modern Baoding, Hebei) before moving south of the Yangtze River in light of the Jin dynasty's loss of the north. Xu Jingzong's father, Xu Shanxin (), was serving as an emissary of Chen Shubao, the last emperor of the Chen dynasty, to Emperor Wen, whose Sui dynasty then ruled the north, in 589, when Sui destroyed Chen to end the Southern and Northern dynasties period and reunify China. Emperor