Pérotin

Pérotin flourished around 1200 in Paris, tied to the Notre Dame school and the ars antiqua style. He built on the polyphonic work of his predecessor Léonin, introducing three- and four-part harmonies where two had been the norm. A music theorist named Johannes de Garlandia mentioned him briefly, but nearly all surviving detail comes from Anonymous IV, a pseudonymous English student who likely studied in Paris and called him Magister Perotinus - a licensed teacher. Anonymous IV named seven titles from a Magnus Liber, including Viderunt omnes, Sederunt principes, and Alleluia Nativitas, that match works still extant. He was presumably French, his name a diminutive of Peter, though no definitive match with contemporary records has been made.