Machaut's death is how scholars date the end of ars nova
Guillaume de Machaut so dominated fourteenth-century French music that modern historians use his 1377 death to mark the turn from ars nova to ars subtilior. Poet-composer in the old troubadour line, he left an unmatched manuscript trail—including the earliest complete Ordinary Mass cycle pinned to one name.
Born around 1300 near Reims—likely taking his surname from Machault some thirty kilometers away—he was one of seven children and died in 1377. Unusually rich biographical traces survive partly because he supervised how his books were copied and kept. Chaucer and other poets admired and imitated his verse; musicologists call him the fourteenth century's central French composer-poet, crowning the poet-composer tradition that reached back to troubadours and trouvères. Modern scholars even use his death to separate ars nova from the following ars subtilior.
He shaped motets and secular fixed forms—rondeau, virelai, ballade—and the expansive lai. Among scarce sacred survivors, his Notre Dame Mass stands as the earliest known complete Ordinary cycle pinned to a single composer. Famous rondeaux such as the palindromic "My end is my beginning" and the springtime rose lyric show secular craft at full polish. Style range is wide; influence defined the era so tightly that chronology still bends around his lifespan.
Self-archiving is the hidden modern habit. A cleric-poet who curated his own corpus accidentally gave later centuries the documentation other medieval composers lack—and a Mass that still anchors textbooks on how polyphony learned to cover the liturgy end to end. The manuscript trail is part of the music's meaning. Using one death as a period label is the ultimate compliment musicology can pay a medieval name.
Source: Guillaume de Machaut
