The name of Niangziguan was first seen in the sentence "Niangziguan's head is even more strange" in Yuan Haowen's poem "You Chengtian Diaoquan" in the Jin Dynasty. In the Ming dynasty, it was "Chengtian Town". Due to frequent border incidents during the Ming Dynasty, in the 21st year of Jiajing (1542), the castle was rebuilt and special garrison guards were set up. Today it is what it was then. In the Qing Dynasty, the "Guguan Camp" was built, and the general headquarters was stationed alone. Guancheng is located at the southern end of "Neisanguan Great Wall" in Wan Li Great Wall, so it is called "the ninth pass of Wan Li Great Wall".
Extended data:
Niangziguan is located at the junction of Hebei and Shanxi provinces. It is the throat of Shanxi and Hebei, the famous pass of the Great Wall, the ninth pass of the Great Wall of Wan Li, and a battleground for military strategists in past dynasties. The existing Guancheng was built in the 20th year of Jiajing in Ming Dynasty (1542).
The ancient castle is commanding by the mountains and rivers, and has two related doors. The east gate is a brick gate for generals, titled "Niangziguan in Zhili", and there is a platform guard on it, which seems to be used to review soldiers and observe the enemy.
Baidu encyclopedia-niangziguan