The Sułkowski family originally lived in a village known as Sułków, now known as Sułkowo Borowe, in the Mława district 100 kilometers (62 mi) north of Warsaw.

On November 2, 1754, Bohemian Queen Maria Theresa of Austria created the Duchy of Bielsko (Herzogtum Bielitz).

[1] His two sons having produced no heirs, according to the rules of the ordynat, his fortune of over 10,000 hectares of land went into the possession of the Prussian government.

August Kazimierz's second youngest brother, Franciszek, did not join the Sułkowski Ordynat and obtained for himself an inheritance, to which entered the Bielsko castle and its fortune.

The Ordynat fortune was willed to the Komisja Edukacjna Narodowa in the moment of the death of the last male heir of the family.

Shortly after the last announcement of the Ordynat, two of the oldest brothers, August Kazimierz and Aleksander Antoni, died in 1786, both heirless.

The occupation of the country by the Prussian and Russian armies in 1792 and, ultimately, the partitions of Poland increased the financial problems.

Baron Lestwitz, from the close-by fortune of Czyrniny, helped Antoni's widow in the administration of the large debts passed to her from her husband.

Afterward, the financial status improved somewhat and Antoni Paweł changed the layout of the Rydzyna Castle park from the French to the English Style.

However, when August Antoni became an adult and married Maria Mycielska in 1843, the situation worsened again on account of the couple's extravagant style in their social life.

With his first wife, Countess Maria Emma Gislana de Sanchez d'Alcantara, he had two sons – Aleksander and Franciszek.

Before his death, in 1905, he signed in Berlin an inheritance agreement recognizing his cousins Henryk Potocki and Antoni Wodzicki as universal inheritors of his property.

The Prussian government, however, believed that the Pruskie Kolegium Szkolne were the legal substitute of the Komisja, and the courts in Poznań agreed.

Following this, in September 1909, the Pruskie Kolegium Szkolne was written into the perpetual usufruct books at Rydzyna as the new owners of the Fundacja.

[citation needed] Since Antoni Stanisław's two sons predeceased him with no children, upon his death in 1909, the Rydzyna line of Princes Sułkowski ended.