What is Early Netherlandish art?

Early Netherlandish art also called Early Flemish art, sculpture, painting, architecture, and other visual arts created in the several domains that in the late 14th and 15th centuries were under the rule of the dukes of Burgundy, coincidentally counts of Flanders. As the terms "Burgundian" and "Flemish" describe only parts of the phenomenon, neither can posit for the whole.