On the basis of documents surrounding Saint-Sauveur in Blois, Theodor Dumitrescu has argued that Prioris is to be identified with the composer "Denis Prieur," making his Latin name "Dionysius Prioris.
Some time after 1500 he probably moved to France, since he is twice called the maître de chapelle to King Louis XII; once in a letter from Ferrara, and once by Jean d'Auton.
Prioris wrote six masses, of which five are still extant, including a famous Requiem, which he may have written for the funeral of Anne of Brittany, who died in 1514.
He also wrote settings of the Magnificat, motets, chansons, and some examples of an early 16th-century genre which blended the last two: the motet-chanson.
Most of his chansons look back to the style of Antoine Busnois and Hayne van Ghizeghem, while his motet writing, and especially his mass writing, shows elements of Italian influence, such as a chordal rather than a densely contrapuntal style.