The Duchy of Brabant was an Imperial State established in 1183. It developed from the Landgraviate of Brabant and formed the heart of the historic Low Countries, part of the Burgundian Netherlands from 1430 and of the Habsburg Netherlands from 1482, until it was dismembered after the Dutch revolt. Present-day North Brabant (Staats-Brabant) was adjudicated to the Generality Lands of the Dutch Republic according to the 1648 Peace of Westphalia, while the reduced duchy remained in existence with the Southern Netherlands until it was conquered by French Revolutionary forces in 1794.
Its territory consisted essentially of the three modern-day Belgian provinces of Flemish Brabant, Walloon Brabant and Antwerp, the Brussels-Capital Region and most of the present-day Dutch province of North Brabant. Its most important cities were Brussels, Antwerp, Leuven, Breda, 's-Hertogenbosch, Lier and Mechelen.
The Flag of Belgium is based on the colors of Brabant's coat of arms: black, yellow, and red.