The memorial is part of the present Episcopal Ordinariate in Rottenburg. Historically, it is the foyer of the Episcopal Palace, the place of residence and work of the Rottenburg bishops. In the spring and summer of 1938, after Sproll abstained from voting, National Socialist groups besieged the palace, threw stones through the windows and daubed inflammatory slogans on the sidewalk. For weeks there were loud rallies in front of the palace demanding the expulsion, recall or resignation of the bishop.

On July 23, 1938, the gate was broken through and Sproll’s apartment was stormed and devastated. The historical gate and the foyer themselves refer to the – also directly physical – persecution of Sproll.