The Daming Palace in Chang'an became the seat of government and the royal residence of the Tang dynasty during the reign of Emperor Gaozong. Daming Palace: The Daming Palace was the imperial palace complex of the Tang dynasty, located in its capital Chang'an. It served as the imperial residence of the Tang emperors for more than 220 years. Today, it is designated as a national heritage site of China, and part of the UNESCO World Heritage Site "Silk Roads: the Routes Network of Chang'an-Tianshan Corridor". The area is located northeast of present-day Xi'an, Shaanxi Province. June 5, 663. Wiki link