Names of Rus', Russia and Ruthenia

The word Rus' or Rus referred initially to a group of Scandinavian Vikings, also known as Varangians, who founded the medieval state of Kievan Rus' in Eastern Europe in the 10th century. The term gradually acquired the meaning of the aforementioned dynastic polity itself, and also the geographic region of its heartlands Kiev, Pereiaslavl' and Chernihiv.