There are remains of an eighth- or ninth-century church at Ardagh, which is known as St. Mel's Cathedral, although it dates from three centuries after the saint's death, and predates the introduction of a diocesan system in Ireland.
The site features remnants of an eighth- or ninth-century church at Ardagh, which is designated as St. Mel's Cathedral, although it predates the era of the saint by three centuries and preceded the implementation of a diocesan system in Ireland.