The saxtuba is an obsolete valved brasswind instrument conceived by the Belgian instrument-maker Adolphe Sax around 1845. The design of the instrument was inspired by the ancient Roman cornu and tuba. The saxtubas, which comprised a family of half-tube and whole-tube instruments of varying pitches, were first employed in Fromental Halévy's opera Le Juif errant in 1852. Their only other public appearance of note was at a military ceremony on the Champ de Mars in Paris in the same year. The term "saxtuba" may also refer to the bass saxhorn.