The Four-Class System (sideng renzhi 四等人制) of Administration During the Yuan Dynasty (1271–1368) in China by Tatiana Frank

“…Ögedei qaγan, 1186–1241), compelled the conquerors to reassess their subsequent plans. During the reign of the Mongols in China, the population was divided into four groups: the Mongols, the semu 色目, the northern Chinese, and the southern Chinese. …”
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