Pulleyblank also writes that although there is now archaeological evidence of the spread of pastoral nomadism based on horse riding from Central Asia into Mongolia and farther east in the first half of the first millennium B.C.E., as far as we have evidence it did not impinge on Chinese consciousness until the northward push of the state of Zhao 趙 to the edge of the steppe in present Shanxi province shortly before the end of the fifth century B.C.E. brought them into contact with a new type of horse-riding “barbarian” that they called Hu 胡. … In Han times the term Hu was applied to steppe nomads in general but especially to the Xiongnu who had become the dominant power in the steppe. Earlier it had referred to a specific proto-Mongolian people, now differentiated as the Eastern Hu 東胡, from whom the Xianbei 鮮卑 and the Wuhuan 烏桓 later emerged.