Han dynasty
To the north of China proper, the nomadic Xiongnu chieftain Modu Chanyu (r. 209–174 BC) conquered various tribes inhabiting the eastern portion of the Eurasian Steppe. By the end of his reign, he controlled Manchuria, Mongolia, and the Tarim Basin, subjugating over twenty states east of Samarkand. Emperor Gaozu was troubled about the abundant Han-manufactured iron weapons traded to the Xiongnu along the northern borders, and he established a trade embargo against the group. In retaliation, the Xiongnu invaded what is now Shanxi province, where they defeated the Han forces at Baideng in 200 BC. After negotiations, the "heqin" agreement in 198 BC nominally held the leaders of the Xiongnu and the Han as equal partners in a royal marriage alliance, but the Han were forced to send large amounts of tribute items such as silk clothes, food, and wine to the Xiongnu.
Xiongnu
Within the Xiongnu culture more variety is visible from site to site than from "era" to "era," in terms of the Chinese chronology, yet all form a whole that is distinct from that of the Han and other peoples of the non-Chinese north. In some instances iconography can not be used as the main cultural identifier because art depicting animal predation is common among the steppe peoples. An example of animal predation associated with Xiongnu culture is a tiger carrying dead prey. We see a similar image in work from Maoqinggou, a site which is presumed to have been under Xiongnu political control but is still clearly non-Xiongnu. From Maoqinggou, we see the prey replaced by an extension of the tiger's foot. The work also depicts a lower level of execution; Maoqinggou work was executed in a rounder, less detailed style. In its broadest sense, Xiongnu iconography of animal predation include examples such as the gold headdress from Aluchaideng and gold earrings with a turquoise and jade inlay discovered in Xigouban, Inner Mongolia. The gold headdress can be viewed, along with some other examples of Xiongnu art, from the external links at the bottom of this article.