AbstractIn the past 10 years, geneticists have investigated the genetic variation of modern Turkic populations as well as ancientdnaof the Xiongnu and others. The accumulated findings of these surveys, however, have not been adequately noted by specialists in Inner Asian history. In order to fill this gap, we conducted a comparative analysis of textual information and genetic survey data on the early and medieval Turkic peoples. First, we examined the information on the origins, identity, and physiognomy of the early and medieval Turkic peoples contained in the Chinese Standard Histories (zhengshi正史). We then discussed how the findings of genetic surveys complement the textual information. Both Chinese histories and moderndnastudies indicate that the early and medieval Turkic peoples were made up of heterogeneous populations. The Turkicisation of central and western Eurasia was not the product of migrations involving a homogeneous entity, but that of language diffusion.