Why did the major Flemish cities have so much influence over the count of Flanders?

The major Flemish cities exerted significant influence over the count of Flanders primarily due to their immense economic strength, large populations, and highly developed administrative institutions, which made the county nearly impossible to govern without their collaboration.1

During the late Middle Ages, Flanders possessed the largest population and the most robust economic development among the principalities of the Low Countries. The cities of Brugge, Ghent, and Ypres were particularly powerful, forming a permanent consultation committee known as the "three members of Flanders." This body held decisive authority over taxation, legislation, justice, and international relations.1

Because these cities were so powerful, they often operated as city-states, especially during periods of revolt or when the count was absent, at which times they automatically assumed the exercise of power. Their influence was so overwhelming that, unlike in neighboring regions, a traditional system of representation by the three estates (clergy, nobility, and burghers) did not develop spontaneously in Flanders; the cities simply did not need to share control with the nobility or clergy.12