"We Gather Together" has a complicated story , starting as a Dutch folk song, "Ey,wilder dan wilt, wie sal my temmen?"
It also has had more than one melody.

The website below traces its history, from a folk song (two melodies), 24 verses, through several revisions to its appearance in Valerius.
My Dutch in non-existant, but those who are interested may read the story, in some detail, with scores, here:
Florimond van Duyse

I haven't looked for a translation of the folk song; it would be interesting to see it.