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In 200 BC, the Weiyang Palace was built at the request of the Emperor Gaozu of Han, under the supervision of his prime minister, Xiao He. The palace survived until the Tang dynasty, when it was burnt down by marauding invaders en route to the Tang capital, Chang'an. It was the largest palace complex ever built on Earth, covering , which is 6.7 times the size of the current Forbidden City, or 11 times the size of the Vatican City.