One of the most renowned of the palace's inhabitants was Marianna Bielińska (c. 1685-1730) - mistress of King Augustus II of Poland. Marianna was a daughter of Grand Marshal of the Crown Kazimierz Ludwik Bieliński, a leader of French party in Poland. His lavish estate in Otwock Wielki was frequented by many state figures including the King himself, who become a lover of his daughter. Soon afterwards Bieliński married his daughter to Bogusław Ernest Denhoff. Despite that Marianna remained King's mistress and eventually divorced Denhoff with Pope's approval. She had a large influence on the King and persuaded him to enter into an alliance with France in 1714. When the new alliance become less beneficial then expected she was dismissed by the King.
Her portrait painted by Ádám Mányoki, along with some other portraits of Royal Mistresses preserved in the Palace on the Water in Warsaw. The Hungarian painter educated in Germany developed his own style and largely influenced the portraiture in Poland.