The earliest definitely datable example of fauxbourdon is in a motet by Dufay, Supremum est mortalibus, which was written for the treaty reconciling the differences between Pope Eugene IV and Sigismund, after which Sigismund was crowned as Holy Roman Emperor, which happened on 31 May 1433.
What is fauxbourdon style?
Fauxbourdon, (French), English false bass, also called faburden, musical texture prevalent during the late Middle Ages and early Renaissance, produced by three voices proceeding primarily in parallel motion in intervals corresponding to the first inversion of the triad.
How does a Fauxbourdon work?
Music. a 15th-century compositional technique employing three voices, the upper and lower voices progressing an octave or a sixth apart while the middle voice extemporaneously doubles the upper part at a fourth below.