"Twas in the Moon of Wintertime" was written in the Huron language by Jesuit priest Father Jean de Brébeuf in 1643 with the title "Jesous Ahatonhia" ("Jesus, he is born"), and set by him to an old French tune, "Une Jeune Pucelle" ("A Young Maid"). This is considered to be the first Canadian carol. The text and music version as it appears in most hymn books was translated by Jesse Edgar Middleton; the music was arranged by H. Barrie Cabena. I learned it long ago from The Burl Ives Songbook.