List of medieval music theorists

Medieval music is the music of the Western Europe during the Middle Ages, from approximately the 6th to 15th centuries. The first and longest era of Western classical music, Medieval music saw the presence of various music theorists, such as Boethius, Hucbald, Guido of Arezzo, Johannes Cotto, Franco of Cologne and Philippe de Vitry.

Medieval music theorists
Also a composer May have been a composer