Gilbert & Sullivan’s The Grand Duke
(a plot summary care of Wikipedia):
In The Grand Duke, Gilbert and Sullivan come full circle, back to the theme of their first collaboration, Thespis: a troupe of actors taking political power. The plot hinges on the misinterpretation of a 100-year-old law regarding statutory duels (decided by drawing cards). The baffled leading man of the troupe, Ludwig, spearheads the rebellion against the hypochondriac, miserly Grand Duke and becomes engaged to four different women before the plot is resolved.