The story of the nosy church official…
Rumor has it that the painter of the chapel fresco (I’ve seen it ascribed to Karel Skréta, Johann Kracker and a variety of other names) liked to work in privacy. One day he spotted a Jesuit church official peeking in on his progress. As punishment, he included the spy in his painting. Espionage, it seems, has been with St. Nicholas Church since the beginning.