Guillaume Du Fay (French: [dy fa(j)i]; also Dufay, Du Fayt; 5 August, c. 1397 – 27 November 1474) was a Franco-Flemish composer of the early Renaissance. A central figure in the Burgundian School, he was regarded by his contemporaries as one of the the leading composers in Europe in the mid-15th century.
From the evidence of his will, he was probably born in Beersel, in the vicinity of Brussels, the illegitimate child of an unknown priest and a woman named Marie Du Fayt. She moved with her son to Cambrai early in his life, staying with a relative who was a canon of the cathedral there. His musical gifts were noticed by the cathedral authorities, who evidently gave him a thorough training in music; he studied with Rogier de Hesdin during the summer of 1409, and he was listed as a choirboy in the cathedral from 1409-12. During those years he studied with Nicolas Malin, and the authorities must have been impressed with the boy's gifts because they gave him his own copy of Villedieu’s Doctrinale in 1411, a highly unusual event for one so young. In June 1414, aged around 16, he had already been given a benefice as chaplain at St. Géry, immediately adjacent to Cambrai. Later that year, on the evidence of music composed, and a later relationship with the Malatesta court, members of which he met on the trip, he probably went to the Council of Konstanz. He likely stayed there until 1418, at which time he returned to Cambrai.
From November 1418 to 1420 he was a subdeacon at Cambrai Cathedral. In 1420 he left Cambrai for Italy – first to Rimini and then to Pesaro, where he worked for the Malatesta family. Several of his compositions can be dated to this period; they contain colloquial references to Italy. There he met the composers Hugo and Arnold de Lantins, who were also among the musicians of the Malatesta household. In 1424 Du Fay returned to Cambrai, because of the illness and subsequent death of the relative with whom his mother was staying. By 1426, however, he had returned Italy. In Bologna, he entered the service of Cardinal Louis Aleman, the papal legate. While in Bologna he became a deacon, and by 1428 he was ordained priest.