At the end of the 17th century, Italian architects Joseph Simon Bellotti and Pompeo Ferrari erected the present Baroque castle on its ancient foundations.

Not only was he an architect but also a manager of stucco workshops and a supervisor of decorative works made by Italian plasterers and sculptors.

Belotti designed the Leszczyńskis' Palace in 'palazzo in modo fortezza' style, following the example of Poggio Reale by Sebastiano Serlio (Serliano).

Another Italian artist who settled in Poland, Michelangelo Palloni from Florence, decorated ceilings in the palace in Rydzyna with splendid frescos.

The Silesian architect Karl Martin Frantz changed roofs, added Rococo decorations and the monumental main gate.

At the end of the 18th century, the residence of the Sułkowski princes, with open-air theater and high school of Piarist Fathers, was the most important cultural and educational center in Great Poland.

In 1994 the castle was awarded by the prestigious international organization Europa Nostra in recognition of the excellence of the restoration work.

The main Baroque rooms were completely restored to their original grandeur according to the historic documentation.

In the library one can find documentation connected with the previous owners of the Castle, The Sułkowski Grammar School and The Association of Polish Mechanical Engineers.