King Gong Li (133 ~ 1374), whose first name was Qi, was the son of King Zhong Su. When he was in office, there was a peasant uprising at the end of Yuan Dynasty in China. At that time, the real power was held in the imperial court of Korea, which was a family of ministers based on big landowners. They were pro-Yuan forces who intermarried with the Mongolian royal family. In fact, King Gong Yu himself is a Mongolian royal family's Xu, named Boyan Timur, and he has been serving in the Yuan Court for a long time. In his early years, he relied on the power of Qi and Quan, a great family of ministers. However, after he acceded to the throne, he decisively sent troops against the Yuan Dynasty, resolutely eliminated the power of Qi and Quan, stopped using the title of the Yuan Dynasty, and restored the traditional official system in Korea, winning to a certain extent. In 1362, King Gongcheng appointed a humble monk, Xin Yun, who was the son of a female servant in Yuchuan Temple. King Gongcheng appreciated some of his views on political reform, made him secularized, entrusted him with a heavy responsibility, and the official was really calm. After Xin Yun was put into use, with the support of King Gong Kui, he let go of the reform, cracked down on the big farm owners who merged land, set up a supervisor to judge the right and wrong of the villagers, returned the land plundered by the big farm owners to their original owners, and restored those handmaiden to their lovers. This reform strengthened centralization, prevented land annexation, and cracked down on the strongmen and liberated slaves, which was of progressive significance at that time and was in the interests of the people. Therefore, it was in line with the people. It's a pity that the trust and support of King Gongcheng to this "saint" has never ended. Because Xin's reform angered the aristocratic families, they colluded, maliciously slandered him for his lust for women, and then falsely accused him of rebellion. The king who was partial to hearing finally fell to the side of the vassal family, and in 1371, Xin Yun was executed for treason. From then on, the court affairs fell back into the hands of the vassal family, and King Gongcheng was killed by eunuchs Cui Wansheng and others in 1374. Although King Gongcheng was not a competent monarch, he was a representative painter at the end of the Koryo Dynasty. He was good at painting and calligraphy, and created many works, such as self-portrait, portrait of Princess Gongcheng (the queen of King Gongcheng) and other figure paintings, landscape paintings and animal paintings. Two pieces of the famous "Great Hunting Map of Tianshan Mountain" are also said to have come from his hands. These are small colored paintings painted on silk. Although the damage is excessive, you can still see the delicate and vivid image and superb artistry. The Gongcheng Mausoleum was carefully conceived by the king who was good at painting and painting, and personally supervised the people's construction.