The article deals with Zdeněk Fibich’s (1850–1900) Variations in B major for piano which Vladimír Hudec, the author of the Tematický katalog Zdeňka Fibicha (Thematic Catalogue of Zdeněk Fibich’s Works), believed to have been lost. Its complete autograph, however, was recently discovered by the author of this article in the music collection of the Prague Hlahol Choral Society. The discovery of this composition, therefore, has substantially changed the existing knowledge of this work – as shown in the following paper, describing its context, such as the Fibich sources linked to it (including the Moser catalogue and the estate of Stanislav Kamenick˘). The article also points out the discrepancies found in the secondary literature.