In 1971, the Faculty of Music at the University of Toronto purchased a medieval manuscript, a Dominican processional. The manuscript E-6 201 (Faculty of Music, Rare Book Room) is the only medieval processional found in Canada and this is the first study devoted too it. It was carefully modelled on the Dominican prototype laid out by Humbert of Romans in 1254. The notation also follows the Humbert codex. One detail does distinguish the Toronto processional from the Humbert prototype, the section devoted to the washing of the saint’ altars. The clue of this processional’s origin is the addition of Stephen of Hungary. The addition of Stephen strongly suggests a Hungarian origin for the Toronto processional.