When Adolf Hitler came into the power in 1933 a lot of works of art in Germany lost their rightful owners simply because of their origin, religion or a political affiliation. The destiny of those pieces of art as well as their owners started to develop in completely another way.
In the name of the purification of German culture the enemies of State were in general forced either to sell or transfer their movable cultural property on the the German Reich. Also, the German museums were clearly recommended to follow the principles of newly established German cultural policy, announced by the dictator.
For that reason many works of art which did not fulfill the Nazi cultural standards were ordered by the Reich to be sold, broken, burnt or destroyed in a different way. An enormous plundering of art collections, legal confiscations of cultural objects previously belonged to the Jews and political adversaries of Nazi regime, illicitly legal sales under duress forced donations of works of art contributed to the move of the enormous machinery of relocations of thousands of artworks which needed their temporally repositories of hiding places.
And Nikolsburg castle became one of them.