The Ash Grove (Welsh: Llwyn Onn) is a traditional Welsh folk song whose melody has been set to numerous sets of lyrics. The most well-known was written, in English, by John Oxenford in the 19th century.
The first published version of the tune was in 1802 in "The Bardic Museum". The book was written by Edward Jones, a harpist. About 4 years later a version with words appeared, under the name "Llwyn Onn". It tells of a sailor's love for "Gwen of Llwyn". The tune might be much older, as a similar tune appears in "The Beggar's Opera" by John Gay (1728), in the song "Cease Your Funning". In 1922 , however Kidson claimed that John Gay's tune derives from the morris dance tune "Constant Billy", which is first known in Playford's "Dancing Master".
The tune of "The Ash Grove" is used for the hymn "Let All Things Now Living" in 1939 by composer Katherine K. Davis. This hymnal version resulted in it being included on a number of Christmas albums up through the 50s; like Jan August's 1955 album "Christmas Favorites" (Mercury Records #MG 20160). It was in use as a hymnal long before the 20th century under the title "The Master Hath Come" by Sarah Doudney (1871) and has been updated since in a retelling of the nativity by Robert Cullinan as "On This Night, Most Holy" (1996). Around 1962 another song called "The Irish Free State" was written to this tune. "The Ash Grove" featured in the 1980 BBC mini-series Pride and Prejudice.