The Lands of the Bohemian Crown, sometimes called Czech lands in modern times, were a number of incorporated states in Central Europe during the medieval and early modern periods connected by feudal relations under the Bohemian kings. The crown lands primarily consisted of the Kingdom of Bohemia, an electorate of the Holy Roman Empire according to the Golden Bull of 1356, the Margraviate of Moravia, the Duchies of Silesia, and the two Lusatias, known as the Margraviate of Upper Lusatia and the Margraviate of Lower Lusatia, as well as other territories throughout its history.