The opening of the text above is easily recognizable as that of the Sanctus, which is sung year-round as part of the Mass ordinary. The added words in italics are a trope text that was included with the chant in B-Tc A 58, a manuscript used by the Confraternity of the Transfiguration in Tournai. This troped Sanctus is known as the Sanctus “Vineux;” it alludes to the metamorphosis of Christ, commonly known as his Transfiguration, on Mount Thabor before the disciples Peter, James, and John. Although the Transfiguration was long celebrated as a feast in the Eastern Church, it only became offi-cially recognized in the Western Church in 1457 (celebrated on August 6). It was not a common theme in popular devotions among the laity before the early decades of the fifteenth century but was celebrated in clerical circles like the Confraternity of the Transfiguration before 1457. This organization consisted exclusively of priests and chaplains who held benefices at the Tournai cathedral.

The Sanctus “Vineux” is a good example of a work appearing in a number of sources that could illustrate personal connections between confraternities, ecclesiastical communities, and composers. The original melody is written in cantus fractus and also appears as the tenor of two polyphonic settings—one by Guillaume Du Fay and one by his presumed teacher, Richard de Locqueville—in the manuscript I-Bc Q 15. In this source, the word “Vineux” appears after an inscription just before the polyphonic setting by Locqueville: “Sanctus vineux secundum Locqueville.” It is also indicated with the name “Vineux” in several manuscripts where it appears in cantus fractus, implying that “Vineux” applies specifically to the monophonic tenor.