Un giorno di regno, ossia il finto Stanislao (A One-Day Reign, or The False Stanislaus) is an operatic melodramma giocoso in two acts by Giuseppe Verdi to an Italian libretto by Felice Romani, based on the play Le faux Stanislas by Alexandre Vincent Pineu-Duval. Un giorno di regno was Verdi's first attempt at comic opera.
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