Why is there another city in Beijing commonly known as Nezha City?

Why is old Beijing called Nezha City? Because there were eleven gates in ancient times, its three gates into the city were Nezha's three heads, the two gates in the north were Nezha's two legs, and the three gates in the east and west were Nezha's six arms.

In the late Ming and early Qing Dynasties, Nezha became the city of Nezha with eight arms, Zhengyangmen became the head of Nezha, the two wells here became the eye of Nezha, and the eight east and west doors added up to the eight arms of Nezha. The Imperial City is the esophagus of Nezha, and nutrients transported from outside Beijing are continuously transported to the Imperial City. The purpose of the whole structure of Nezha City is to set off the nobility of the imperial city.