Johannes de Grocheio

Johannes de Grocheio (or Grocheo) (Ecclesiastical Latin: [jɔˈan.nɛs dɛ ɡrɔˈkɛj.jɔ]; c. 1255 – c. 1320) was a Parisian musical theorist of the early 14th century. His French name was Jean de Grouchy, but he is best known by his Latinized name.