Helian Bobo
At its height the population was around 10,000, likely to have been greatly supplemented by an encircling encampment of nomadic kin groups at certain times of the year. White cities were generally ceremonial and status centers built following conquest, rather than outright military positions, white being a holy color for the Xiongnu. Yet the thickness of the walls was certainly required since the city was originally built at a time of perpetual warfare. Both internal and external threats existed - for instance, Helian Bobo was attacked with an army by his deputy Helian Gui in 424 following a dynastic dispute.