Royal Swedish Opera Daniel Auber and "Un ballo in maschera" by Verdi.) Following the assassination, the opera house was closed until 1 November 1792, when it was opened again, which by some was considered shocking. The son of Gustav III, King Gustav IV Adolf of Sweden, did not like the Opera, possibly because of the murder of his father, and disliked the fact that the scene of his father's murder was used as a place of amusement and leisure, and when a frivolous play was performed for his queen Frederica of Baden in 1806, he decided to close it down. It remained closed
Gustavo III (Verdi) the outline of the opera was complete, and Verdi began to create musical sketches of significant scenes. At the same time, word came of the seven requirements imposed by the Naples censorship. These included that (i) "The King must become a Duke"; (ii) "the action must be transferred to a pre-Christian age"; (iii) the conspirators must not hate the Duke because they wanted to take power; and (iv) "no firearms". Somma had several suggestions, including a possible new title, "Il duca Ermanno" with a 12th Century setting, which Verdi rejected; but he did accept the proposed change to Pomerania. The