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Nine Prefectures, Zheng City.

This was the center of the Nine Prefectures' Zhengzhou. It was also the main city of the city.

There was no such thing as a Royal City or imperial city, or even an imperial city in the Nine Regions. Here, the top-level cities were called the main city, and Zheng Du was the main city.

The reason was very simple, it was the location of the Zheng Family