Part of Tutto Verdi series - Un giorno di regno (2010) Parma. Un giorno di regno, ossia il finto Stanislao (A One-Day Reign, or The Pretend Stanislaus, but often translated into English as King for a Day) is an operatic melodramma giocoso in two acts by Giuseppe Verdi to an Italian libretto written in 1818 by Felice Romani. Originally written for the Bohemian composer Adalbert Gyrowetz, the libretto was based on the play Le faux Stanislas written by the Frenchman Alexandre Vincent Pineu-Duval in 1808.