High fantasy, or epic fantasy, is a subgenre of fantasy fiction that is set in invented or parallel worlds. Built upon the platform of a diverse body of works in the already very popular fantasy genre, high fantasy came to fruition through the work of authors such as C.S. Lewis and, foremost, J.R.R. Tolkien, whose major fantasy works were published in the 1950s. While it is far from being the oldest fantasy subgenre, high fantasy, along with sword and sorcery, has become one of the two genres most commonly associated with the general term fantasy.