Johannes de Quadris

Johannes de Quadris (Quatris) (before 1410 – 1457?) was an Italian composer of the early Renaissance. He was one of the first composers of polyphony associated with the basilica of St. Mark's in Venice, and the earliest known composer to write a polyphonic setting of the Magnificat for four voices. He was a priest, and originally from the diocese of Valva-Sulmona, in the vicinity of L'Aquila, in the Abruzzo region of central Italy. Sometime before 1436 he began to work as a singer at San Marco in Venice