Who was guillaume dufay? what contributions did he make to renaissance music?

Guillaume Du Fay 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 leading composers in Europe in the mid-15th century.  In his music he created the characteristic style of the Burgundian composers that links late medieval music with the style of later Franco-Flemish composers of the renaissance.