Guillaume de Machaut 

c.1300

1377

Guillaume de Machaut was a medieval French poet and composer. He is a part of the musical movement known as the ars nova. Machaut helped develop the motet and secular song forms (particularly the lai and the formes fixes: rondeau, virelai and ballade). Machaut wrote the Messe de Nostre Dame, the earliest known complete setting of the Ordinary of the Mass attributable to a single composer.