This union of the government over all the provinces in two families so closely connected rendered the preponderance of the rulers too strong for that balance hitherto kept steady by the popular force. The former could on each new quarrel join together, and employ against any particular town their whole united resources; whereas the latter could only act by isolated efforts for the maintenance of their separate rights. Such was the cause of a considerable decline in public liberty during the fifteenth century. It is true that John the Fearless gave almost his whole attention to his French political intrigues, and to the fierce quarrels which he maintained with the House of Orleans. But his nephew, John, duke of Brabant, having married, in 1416, his cousin Jacqueline, daughter and heiress of William IV., count of Holland and Hainault, this branch of the House of Burgundy seemed to get the start of the elder in its progressive influence over the provinces of the Netherlands. The dukes of Guelders, who had changed their title of counts for one of superior rank, acquired no accession of power proportioned to their new dignity. The bishops of Utrecht became by degrees weaker; private dissensions enfeebled Friesland; Luxemburg was a poor, unimportant dukedom; but Holland, Hainault, and Brabant formed the very heart of the Netherlands; while the elder branch of the same family, under whom they were united, possessed Flanders, Artois, and the two Burgundies. To complete the prosperity and power of this latter branch, it was soon destined to inherit the entire dominions of the other.