Meanwhile the dissensions amongst the different members of the royal family only increased. The marriage of the Duc d’Aquitaine with Marguérite de Bourgogne had turned out as badly as possible. He slighted and neglected her and made open love to other people. One of the ladies of the Queen’s household especially was his mistress, he wore her colours and device to the great indignation of the Duke of Burgundy, who took the part of his daughter. Isabeau seems to have done the same, for it is frequently mentioned that the Duchesse d’Aquitaine was with the Queen while the Duke was elsewhere.
There was open war between Burgundians and Armagnacs. The Duke of Burgundy had placed his own people in the household of his son-in-law, and tried by all means to gain influence over him, which seemed to be easy enough, and to retain it, which was not easy at all, as no dependence whatever could be placed on any friendship, affection, or opinion of his lasting a single week. The Comte de Clermont, Duc de Bourbon by the death of his father, was like him, an Orléanist. In company with the Ducs de Berry and Orléans, the Comtes d’Alençon and Armagnac, and the Sire d’Albret he had entered into a treaty with the English, offering, among other concessions, to restore to them the duchy of Aquitaine. This treaty was discovered and the above-named princes, who had taken refuge in Bourges, were besieged there by the Burgundians about the end of June, 1412.
But the Duc d’Aquitaine began to get tired of these constant quarrels of Burgundians and Armagnacs, for whose sake the kingdom, which was his own inheritance, was being wasted and destroyed, and he resolved to put a stop to the war. To the consternation of his father-in-law he forbade the gunners and engineers to fire any more, or to demolish or destroy the walls, gates, or fortifications of Bourges, saying that the war had gone on long enough. The Duke of Burgundy said that the sooner it was finished the better, only it must be by the complete subjection of the Armagnacs. To which the Duc d’Aquitaine rejoined that he would doubtless welcome their submission to the King, his father, but that in any case this had gone on too long already, to the detriment of the kingdom; that the discredit would fall upon him, the heir of France, and that the opposing party were his uncles, cousins, and near relations, against whom he refused any longer to fight. The Duke of Burgundy was obliged to submit, the siege was raised and peace for a short time restored.[246]