Modern Ruthenia traces back to the Kievan Rus, a Slavic state created after the Vikings invasions. The Rus were defeated and invaded by the Mongols, and after they retired, the conformation of the Kingdom of Poland took over these lands, until it became the Polish-Lithuanian Commonwealth. Ruthenia (Polish Ruś), was the name of several provinces of east-Slavic origin in the southern part of the Crown of Poland, but there was no administrative division composing all these governorships.