2 vihuelas at the fifth.
No vocal model survives for this work
The first four lines of the text are based on the “Obsecro te” prayer (to the word orphanarum)
This prayer was a favorite during the later part of the Middle Ages and invariably appeared in Books of the Hours from the 15th century and onwards.

Elders points out that the text, a paraphrase of the lengthy well-know prayer, appears related to a version found in the book of hours of Mary of Burgundy.
Valderrábano’s text omits the words shown here in italics:
Obsecro te Domina sancta Maria mater Dei, pietate plenissima, summi regis filia, mater [dei] gloriossisima, mater orphanorum, consolatio desolatorum, quam filius tuus unigenitus [coronavit], salva me, honorificentia populi mei.

Elders concludes on stylistic grounds that there is no stylistic or other consequential evidence to dispute Josquin’s authorship. The work is published as an “opus dubium” in vol. 24 of NJE, no 24.8 in a hypothetical reconstruction by Willem Mook.