Les Danaïdes is an opera by Antonio Salieri, in five acts: more specifically, it is a tragédie lyrique. The opera was set to a libretto by François-Louis Gand Le Bland Du Roullet and Louis-Théodore de Tschudi, who in turn adapted the work of Ranieri de' Calzabigi (without permission). Calzabigi originally wrote the libretto of Les Danaïdes for Christoph Willibald Gluck, but the aged composer, who had just experienced a stroke, was unable to meet the Opéra's schedule and so asked Salieri to take it over. The plot of the opera is based on Greek tragedy and revolves around the deeds of the mythological characters Danaus and Hypermnestra.