The burgraviate included the neighbouring settlements of Świebodzice, Szczawno, and Pełcznica. When the last Świdnica duke Bolko II the Small died in 1368 without children, the castle's estates passed to the Luxembourg king Wenceslaus IV of Bohemia, the son of Bolko's niece Anne, while his widow Agnes of Habsburg reserved the usufruct for herself. After her death in the year 1392, King Wenceslaus, also King of the Romans since 1376, seized the Duchy of Świdnica and obtained Książ Castle.