[3] It is known from a single source, the Cancionero de Upsala, published in 1556 in Venice; a unique copy is preserved at the library of the University of Uppsala.
[8] The Immaculate Conception is mentioned in the lyrics: El lobo rabioso la quiso morder Mas Dios Poderoso la supo defender Quísola hacer que no pudiese pecar Ni aun original esta virgen no tuviera.
The song also mentions themes of the Incarnation and Christmas: Éste que es nacido es el Gran Monarca Cristo Patriarca de carne vestido Ha nos redimido con se hacer chiquito Aunque era infinito finito se hiciera.
The Monkees' producer, Chip Douglas, had performed it himself with his former band, the Modern Folk Quartet, on their 1964 album Changes.
The song was performed in Spanish at King's College, Cambridge in their 1992 Christmas Eve broadcast service of "Nine Lessons and Carols".