A good question because the counts of Flanders an the Dukes of Brabant were NOT insignificant. They lend their lands from both the French king and the German Emperor. they were both border territories, and were therefore semi - independent.

Without them, history won't be the same.they played a leading role in some of the most important battles of history like the Battle of Bouvines ( 1214 ), The Battle Of The Golden Spurs ( 1302 ) and the Battle of Woeringen.

( more info WIKIPEDIA ! )

My opinion : divide Flanders ( or modify the map historicly correct ) AND ADD THEM !