"Rusalka" ("The water spirit", Prague, 1901), with a libretto by Jaroslav Kvapil (1868-1950) after "Undine" (1811) by Friedrich de la Motte Fouqué (1777-1843), "Den lille havfreu" ("The little mermaid", 1837) by Hans Christian Andersen (1805-1875) and the north-west European folk tradition of Melusine