It mainly describes historical events such as Emperor Yongle's move to Beijing and Emperor Chongzhen's hanging of Jingshan Park in the Ming Dynasty.
Due to the geographical location, the capital of the Ming Dynasty was close to Shanhaiguan, an important border town, and it was also the place where the son of heaven lived, so the people called it "the place where the son of heaven guarded".
However, by the time of Emperor Chongzhen, there was a siege by Li Zicheng in the Ming Dynasty, and the forces of the late Jin Dynasty were eyeing up outside, but at that time, most of the troops of the late Jin Dynasty were blocked from Shanhaiguan. In A.D. 1644, Li Zicheng captured the capital of Ming Dynasty, and Emperor Chongzhen hanged Jingshan Park, which was called "the king perished" by the people.
Extended data
"The son of heaven protects the country" is a unique saying in the Ming Dynasty. At that time, there were still remnants of the Yuan Dynasty harassing the border in northern Xinjiang in the early Ming Dynasty, and the areas outside Shanhaiguan were mainly inhabited by ethnic minorities. In order to ensure the stability of northern Xinjiang and customs, implement effective control and prevent the country from splitting, Judy moved to Beijing after she acceded to the throne.
The Ming dynasty calculated that it was 3 15 years before and after the southern Ming dynasty, and no relatives, no compensation, no land division and no tribute. After countless wars, many kings were personally captured, but none surrendered. By the early Qing dynasty, the Ming royal family was basically killed by Manchu. Later generations described the Ming Dynasty as the most backbone dynasty in China's history as "the emperor protected the country and the king died in the country".
References:
Baidu Encyclopedia-The emperor protects the country and the king dies.