57.
di Cosmo, Nicola, “The Northern Frontier in Preimperial China,” in Cambridge History of Ancient China, 960
Google Scholar. According to Di Cosmo, “This term, whatever its origin, soon came to indicate an ‘anthropological type’ rather than a specific group or tribe, which the records allow us to identify as early steppe nomads. The Hu were the source of the introduction of cavalry in China” (951-52). I think one can be more specific. 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. Di Cosmo makes the useful point that the famous adoption of “Hu clothing,” that is, riding gear, by the ruler of Zhao was not primarily designed to defend against nomad attacks but “to gain an advantage against other Chinese states” (960).
The Xiongu had, I believe, a quite different ethnic origin. There is good reason to believe that before they were driven north out of the Ordos by the Qin general Meng Tian 蒙׳ in 215 B.C.E., the Xiongnu had been part of a so-called Rong people, called Yiqu 義渠, that had dwelt in the region now known as Shaanbei 陕北 and had been under Chinese influence for centuries. See
Pulleyblank, Edwin G., “Ji Hu 稽胡: Indige-nous Inhabitants of Shaanbei and Western Shanxi,” in Opuscula Altaica: Essays Presented in Honor of Henry Schwarz, ed. Kaplan, Edward H. (Bellingham: Western Washington University Press, 1994), 499–531
Google Scholar.