Daniel James (23 January 1848 – 16 March 1920), also known by his bardic name of Gwyrosydd, was a Welsh poet and hymn-writer, best known for writing the words of the popular hymn, "Calon Lân" (published in 1892).
[1] He began to write verse and assumed the bardic name Gwyrosydd (probably meaning "place of privets"[citation needed] (gwyros & territorial suffix -ydd) or possibly "Gower moorlands" (Gŵyr & rhosydd)).
He later found work in Tredegar, Dowlais Ironworks, Blaengarw, and Mountain Ash, Rhondda Cynon Taff, where he spent 20 years.
[4][5] In February 2018 a group of local residents in Treboeth gathered to plan a commemorative event to mark the centenary of the death of Daniel James in March 2020.
This meeting formed the basis for the creation of The Calon Lan Society, which is dedicated to promoting the hymn and those involved in composing it.