Flanders, Flemish Vlaanderen, Medieval principality extending along the coast of the Low Countries. Its lands are now included in the French département of Nord, the Belgian provinces of East Flanders and West Flanders, and the Dutch province of Zeeland. Ruled by Baldwin I in 862, Flanders began to grow as a commercial centre, fostered by its strategic location between the Mediterranean Sea and the Scandinavian and Baltic countries. It passed to Burgundy in 1384 and then to the Austrian Habsburgs in 1477. It remained part of the Netherlands under Spanish rule in the 17th century. It was the scene of fighting during both World War I and World War II. Limited autonomy was granted to Belgian Flanders in the 1980s, and it became one of the three regions in the new federation of Belgium in 1993.