Guillaume Dufay composes a motet on the Virgin Mary called "Flos Florum".
The dedication of the cathedral of Florence was celebrated by Pope Eugenius IV and the papal chapel, then resident in Florence. The Pope's magister capellae (master, or leader, of the chapel) was then Guillaume Dufay, a native of the region of Cambrai in northern France.
The operai of the Florentine Cathedral stated that in order to improve the level of divine worship there, Ugolino de Giugnis, a canon of the Cathedral, was commissioned to elect "Magister Benotto and his associates who sing at the church of San Giovanni (the Baptistry) to sing Vespers at Santa Maria del Fiore on festive and solemn days." Another document dated the same day mentions writing to Lorenzo de' Medici, "ambassador of Florence to the pope, presently in Ferrara,' so that he could inform the pope of the decision, specifying the number of singers to join Benotto as three.