Radziwill was Governor of the Duchy of Prussia (Brandenburg-Prussia) (generalny gubernator Prus Książęcych) since 1657.
"Stephen Báthory, who was king of Poland, died in 1586, and the Poles were divided between wishing to be ruled by the Zamoyski family and the Zborowski family. Polish law at that time stated that if electors could not agree upon a king, an outsider should be appointed "rex pro tempore" (temporary king). Radziwill proposed that Saul Wahl Katzenellenbogen be appointed temporary king, and Wahl was elected to shouts of "Long live King Saul!"
After Jakub Ludwik Sobieski's death in 1737, the castle passed to the Radziwill princely family and then (in 1801) to Count Łukasz Komarnicki whose heirs sold it to the Austrian crown in 1834.