Arnulfus, Gileno 14??-?? France, ? - ?, ?
choirmaster, theorist, choirmaster at the Duomo di Milano (Milan Cathedral), wrote a treatise of musical sociology dealing with the categories of
musicians, including a study on the scale of those who have basic musical knowledge up to the highest grades with the ability to sing by modulating
 Le sovenyr. 3vv
ms Codex Medici 14/15th century Biblioteca Vaticana Cappella Giulia, Rome
 Magnificat octavi toni "Et exultavit". Versets. 4vv
ms 1490 Librone 1, Archivio della Fabbrica del Duomo, Milan