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Le roi d'Ys is an opera in three acts by the French composer Édouard Lalo, to a libretto by Édouard Blau. It is based on the old Breton legend of the drowned city of Ys which was, according to the legend, the capital of the kingdom of Cornouaille. The opera includes a noteworthy aubade for tenor, in act 3, titled "Vainement, ma bien-aimée" (In vain, my beloved). Le roi d'Ys premiered on 7 May 1888 at the Théâtre Lyrique in Paris, in a production by the Opéra-Comique. Within France, Le roi d'Ys was regarde as Lalo's most recognized work. This poster by was produced for the opera's premiere.Poster credit: