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 May 31, 1433.
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Fauxbourdon (also Fauxbordon, and also commonly two words: Faux bourdon or Faulx bourdon) – French for false bass – is a technique of musical harmonisation used in the late Middle Ages and early Renaissance, particularly by composers of the Burgundian School.