The paper reports on the state of Polish and Belarusian scientists’ research on eighteenth century reconstruction and pictorial decorations of the Corpus Christ Church in Nieśwież. On the basis of the inquiry conducted based on Belarusian, Polish and American archives, the author forms a new hypothesis that the reconstruction and church decoration was done by a North Italian architect, Maurizio Pedetti. This hypothesis reveals the network of European artistic and ideological connections, part of which became Nieśwież through the artistic patronage (...) of the Radziwiłł family. (shrink)