The first half of the Tang Dynasty’s rule was largely a period of progress and stability until the An Lushan Rebellion and subsequent decline of central authority in the later half of the dynasty. In ...The first half of the Tang Dynasty’s rule was largely a period of progress and stability until the An Lushan Rebellion and subsequent decline of central authority in the later half of the dynasty. In 662, Emperor Gaozong moved the imperial court to the Daming Palace, which became the political center of the empire and served as the royal residence of the Tang emperors for more than 220 years.