China proper, minus these external provinces, was again united under the Sung dynasty (960-1127), but split into the northern (Tatar) and southern (Chinese) kingdoms. In the 13th century arose the Mongol power, and Kublai Khan conquered China.
When the Mongol conquests threw Asia open to Frank travellers in the middle of the 13th century their minds were full of Prester John; they sought in vain for an adequate representative, nor was it in the nature of things that they should not find some representative.
There are also versions of them in the modern Persian, Malay, Mongol and Afghan languages.
The Mongol race is represented in Russia by the Kalmucks, who inhabit the steppes of Astrakhan between the Volga, the Don and the Kuma.
Uzbegs and Kirghiz have but small affinity with the Mongol element of Asia.