House of Valois-Burgundy
Most of the Imperial and French fiefs in what is now the Netherlands and Belgium were united in a personal union by Philip the Good, Duke of Burgundy, in 1433. The House of Valois-Burgundy and their Habsburg heirs would rule the Low Countries in the period from 1384 to 1581. Before the Burgundian union, the Dutch identified themselves by the town they lived in or their local duchy or county. The Burgundian period is when the road to nationhood began. The new rulers defended Dutch trading interests, which then developed rapidly. The fleets of the County of Holland defeated the fleets of the Hanseatic League several times. Amsterdam grew and in the 15th century became the primary trading port in Europe for grain from the Baltic region. Amsterdam distributed grain to the major cities of Belgium, Northern France and England. This trade was vital because Holland could no longer produce enough grain to feed itself. Land drainage had caused the peat of the former wetlands to reduce to a level that was too low for drainage to be maintained.