The four sons of King John became very wealthy men.

Philip the Bold, Duke of Burgundy, by marrying the heiress of the Count of Flanders acquired the Flemish territory and the wealth obtained from the wool trade and manufacture there.

Berry and Anjou were great provinces in France yielding a large revenue to their two Dukes.

Each of these princes employed several artists to illuminate books for him in the most splendid way; they built magnificent chateaux, and had tapestries and paintings made to decorate their walls.

They employed many sculptors and goldsmiths, and all gave each other as presents works of art executed by their favourite artists.