According to the most popular story, this man built the Forbidden City.

The Forbidden City is a masterpiece of ancient palace art in China and one of the most magnificent palace buildings in the world. A large number of craftsmen and people have made great efforts to this end, and even sacrificed countless lives. Unfortunately, they are all unknown. According to the most popular saying at present, the designer of the Forbidden City was an outstanding craftsman in the Ming Dynasty, and his surname was Kuaimingxiang. Born in the 31st year of Hongwu (1398) and died in the 17th year of Chenghua (148 1). He was born in Xiangshan, Wuxian, Suzhou (now Wuxian, Jiangsu). At that time, there was a Xiangshan gang among the craftsmen who went to Beijing, all of whom were Xiangshan people in Wuxian or their disciples. They are often good at carpentry, and many of them are excellent plasterers, painters, masons, ash pickers, sculptors and painters. Kuai Xiang is the leader of the craftsmen of Xiangshan Sect. One of his stories has been circulated among the people. It is said that during the construction of the palace, Myanmar presented a huge piece of wood to the Ming Dynasty, and Judy ordered it to be made into the threshold of the main hall, but a carpenter accidentally sawed it wrong and it was more than a foot shorter. The carpenter turned pale with fear and hurried to report to Kuai Xiang. Kuai Xiang, let the carpenter cut down more than a foot. Everyone was surprised. After that, Kuaixiang carved two faucets at both ends of the threshold, and then put a bead on each side, and made innovations to make the threshold detachable. The emperor was very happy and praised it. This is commonly known as "Jin'gangtui Rock Rock" (living threshold). Kuai Xiang, whose architectural level was affirmed by the imperial court, was very clever. When building palaces and pavilions, he can draw design drawings with only a little calculation. After the construction is completed, the size of the building is exactly the same as the design. Kuai Xiang's architectural attainments were highly praised, and the emperor often called them Kuailuban. Kuai Xiang later served as Assistant Minister of the Ministry of Industry. Fu Yamen of the Ministry of Industry is also a high-ranking official, but he is humble and frugal. Although he resigned and retired in his later years, whenever someone asked him about construction projects, he was very enthusiastic to make suggestions. After the lightning strike, he presided over the reconstruction in 1420, and the Forbidden City was built. Only nine months later, all three halls were burnt down because of lightning. There is also a legend. It is said that after the palace was built, Zhu Di was so proud that he found an official who knew divination and asked him to calculate a divination. The official said: "There will be a fire in the palace on the eighth day of April next year." Judy was furious. Unexpectedly, on this day of the second year, the weather suddenly changed, and the thunder and lightning really hit the three halls. It was not until the orthodox (Ming Yingzong year, 1436- 1449) that the imperial court made repairs. This time, Kuai Xiang is still in power. In a map of Miyagi in Ming Dynasty collected by China History Museum, the figure painted under Chengtianmen (equivalent to Tiananmen Square today) is said to be Kuai Xiang. There used to be a Kuaishilang Hutong in Beijing. It is said that he once lived there. Most of the descendants of Kuaixiang inherited his skills. Until the end of the Qing Dynasty, there was still a saying that "Jiangnan craftsmen all came from Xiangshan".