The Tang Dynasty (6 18 ~907) is recognized as one of the most powerful times in China. Li Yuan established the Tang Dynasty in 6 18, with Chang 'an (now Xi City, Shaanxi Province) as its capital and Luoyang as its capital. In its heyday, in the 7th century A.D., the desert area of Central Asia was also its world. In 690, Wu Zetian changed her name. " ...