(c. 1160–1205 or 1225).
Fr. composer whose identity is unknown. Choirmaster of chapel on site of present Notre Dame Cath., Paris, and leader of what became known as Notre Dame Sch. Wrote liturgical mus. in style known as ars antiqua and took leading part in revision of Léonin's theoretical treatise Magnus liber. Among his finest vocal works is the Beata viscera.