The States of Brabant were the representation of the three estates (nobility, clergy and commons) to the court of the Duke of Brabant. The three estates were also called the States. Supported by the economic strength of the cities Antwerp, Brussels and Leuven, the States always were an important power before the rulers of the country, as was reflected by the charter of the duchy.
After the duchy of Brabant and all Seventeen Provinces of the Netherlands came under the rule of the dukes of Burgundy, the States of Brabant became the host of the States-General of the Netherlands, who used to assemble in Brussels.
In 1579 and 1580, during the Eighty Years' War, most cities and States of Brabant joined Dutch independence declaration (Union of Utrecht and Act of Abjuration), but Spanish troops reconquered most of the territory of the duchy and restored Spanish Catholic rule (except for North Brabant. See also Siege of Antwerp (1584-1585)).
By the end of 1789, the States of Brabant again declared independence, this time from Austrian imperial rule, and, on January 11, 1790, they joined the United States of Belgium. All Southern Netherlands "States" disappeared four years later because of the French revolutionary occupation.