Sophie Polyxena Concordia, the Dowager Fürstin, was compelled to accept that the Catholic Fürst, William Hyacinth, would take possession of the Reformed lands and the city of Siegen.

[17] To drive out this occupation by Nassau-Dillenburg and Nassau-Diez, Elector Clemens August of Cologne called in the Landesausschuß in his countries bordering the Siegerland.

On 20 August 1735, peasants from Cologne crossed the borders of the Principality of Nassau-Siegen and plundered "was ihnen vorkam" ("what was in front of them").

[17] Even as a widow, Sophie Polyxena Concordia continued to live in the Nassauischer Hof, which since the mid-18th century has been called the Untere Schloss.

[18] During the visits to his German lands in 1741 and 1742, Prince William IV of Orange-Nassau stayed with Sophie Polyxena Concordia and her mother-in-law Amalie Louise in the Nassauischer Hof in Siegen.

[18] In 1759, Sophie Polyxena Concordia lost her three living daughters, the eldest and the third died in April, and the youngest in June.

In the light of a strong flashlight one could see that on the coffin of Sophia Polyxena Concordia, the artistic bronze handles covered with patina were particularly striking.