Noin-Ula burial site
Many immigrants lived in the Xiongnu pasturelands, but at first they did not mix with the Xiongnu. To be a Xiongnu, one had to be a member of a clan, born of Xiongnu parents. The newcomers were well off, but were outsiders, and could marry only among themselves, not the Xiongnu. Only later did they intermix, increase in numbers, even created a state that existed from 318 to 350 AD.
Emperor Wen of Han
In 169 BC, Chao Cuo (晁錯), then a low-level official, offered Emperor Wen a number of suggestions for dealing with the Xiongnu. Emperor Wen was impressed, and made him a member of Crown Prince Qi's household. At Chao's suggestion, in 168 BC, Emperor Wen instituted the policy that if people contributed food for use by the northern defense force against Xiongnu, they could receive titles or have their crimes pardoned.