Introduction to Juercha City: Juercha City was built in the early Jiajing period of the Ming Dynasty. It is one of the ancient Jurchen Ning pagoda cities in Jianzhou in the Ming Dynasty. Ninggu Pagoda is Manchu, meaning "Sixth Patriarch". The Sixth Patriarch is the six sons born to Nurhaci's great-grandfather Fuman. The eldest son is Deshiku, the second son Liu Chan, the third son Suo Chang'a, the fourth son is Nurhaci's grandfather Jue Chang'an, the fifth son Baolang'a, the sixth son Zi Baoshi. The six sons are commonly known as the six kings, and they are also called the six ancestors. They each built a city and lived in six places, forming a military defense force to resist external invasion. Chao'ercha is the walled city where Zu Deshiku, the great uncle of Nirhachi, lives.