'''''Si j'étais roi''''' (English: ''If I Were King'')There is no connection between Adam's opera and the novel ''If I Were King'' later made into a film of the same name is an opéra-comique in three acts by Adolphe Adam. The libretto was written by Adolphe d'Ennery and Jules-Henri Brésil. It was first performed in Paris at the Théâtre Lyrique (Théâtre-Historique, Boulevard du Temple) on 4 September 1852, opening with a dual cast to allow performance on successive evenings (it made up half of all performances at the Théâtre Lyrique in the last four months of the year and reached over 170 performances in its first ten years). The production was considered lavish, with expensive costumes and jewels being worn by the cast.Walsh TJ. ''Second Empire Opera - The Théâtre-Lyrique Paris 1851-1870.'' John Calder Ltd, London, 1981. The staging is described in the Goncourt brothers' ''Mystères des Théâtres''.
It was then staged in Brussels (1853), New Orleans (1856), Turin (1858) and Soerabaya (1864).Loewenberg A. Annals of Opera. London, John Calder, 1978.
Though less popular than ''Le postillon de Lonjumeau'', it is often regarded as Adam's finest work. The well-developed overture was quite popular, particularly on recordings. Vocal highlights include the soprano air "De vos nobles aïeux" and the couplets for baritone "Dans le sommeil, l'amour".