History 31 years (1603), Nuerhachi began to build the castle here. Two years later, the outer city was added. Inner city week 2 kilometers, Nuerhachi and his relatives live. Outer city week 4.5 kilometers, living elite. Outside the north gate of the outer city, blacksmiths and bowsmiths live in partitions. Forty-four years (1616), Nourkhachi Khan, the founding number is Jin (historically called Houjin)