Puccini's opera "Tosca" is set in Rome on the day of the battle of Marengo, and the conflict between Papists and Republicans is an important part of the plot.
Puccini's opera "Tosca" is set in Rome three days after the battle of Marengo, which is how long it took for the news of Napoleon's victory to reach Rome. The conflict between Papists and Republicans is an important part of the plot.