Guillaume de Machaut’s Messe de Nostre Dame (Mass of Our Lady) is the first complete, polyphonic setting of the Mass Ordinary known to be written by a single composer. Composed in the early 1360s at Reims Cathedral, it transformed the way sacred music was structured, moving away from anonymous, disjointed fragments toward a unified artistic whole. A Masterpiece of the Ars Nova
: The work includes the five sections of the Ordinary —Kyrie, Gloria, Credo, Sanctus, and Agnus Dei—plus the dismissal, Ite Missa Est . Machaut Messe de Nostre Dame
The Mass was likely written for the Saturday "Lady Mass" at Reims Cathedral , where Machaut served as a high-ranking cleric. Guillaume de Machaut’s Messe de Nostre Dame (Mass