ポロツク公国
The Principality of Polotsk (; ; ), also known as the Duchy of Polotsk or the Polotskian Rus', was a medieval principality of the Early East Slavs. The origin and date of state establishment is uncertain. Rus' Chronicles mention Polotsk being conquered by Vladimir the Great, and thereafter it became associated with the Rurik dynasty and Kievan Rus'.