Principality of Polotsk
“Połock, in Latin Polocia, Polocium, lies on the right bank of the Dvina, and is regarded as one of the oldest gords of Rus’. In the 13th century, the Principality of Polotsk was ruled by Kievan princes, but in app. 1225 it was seized by the Lithuanians under Duke Mindaugas (...) Duke Vytautas named the first starosta of Połock, and in app. 1500, the starosta was renamed into the Voivode of Połock, while the Duchy was turned into a voivodeship, divided into two equal halves by the Dvina (...)