This song is based on a famous Welsh harp melody "Ar Hyd Y Nos
", which can be dated to c1800 but is probably much older. While "Men Of Harlech
" nearly became the Welsh National Anthem, "All Through The Night" has often been mistaken for it; that honor though belongs to "Land Of My Fathers
The English version is often set to a lullaby by Harold Boulton, this might be called the popular version, but there are other sets of lyrics. The 1862 publication Welsh Melodies
contains an English version by T. Oliphant.