Les Sylphides
The famous ballet "La Sylphide" ("The (Female) Sylph", Paris, 1832) is a prominent example of sylph lore in theater in the 19th century. It appeared in a second version in Denmark in 1836. A similarly themed opera "The Mountain Sylph" appeared in England in 1834. Sylphs again took to the stage in the 1909 ballet "Les Sylphides".