Mean-while, Blanche, his eldest sister was divorced by her husband Henry the fourth, for no fault of her own; and the count of Foix (the husband of Leonora her sister) in order to possess himself of her right to the crown of Navarre, gained possession of her person and is reported, by connivance with his own wife, to have put an end to her days. After this, he turned his views toward the protection of France, which he hoped to secure by the marriage of his son Gaston to Magdalen daughter of Charles the seventh, and by a further union of interests between the crowns of France and Arragon. The advantage of these skilful manoeuvres soon displayed itself, when the Catalans, enraged at the death of the prince of Viana, which they attributed whether justly or unjustly to the king his father, revolted, and their example was followed by almost all the states of Arragon. King John, upon this, mortgaged the counties of Cerdagne and Roussillon to France, in order to obtain supplies to carry on the war, and the count de Foix obtained the principal command in the conduct of it. The rebels finding themselves too weak, naturally applied for assistance to Castille, and the war soon assumed a new face, the principals on each side being the king of Arragon and the count of Foix, and the king of Castille. The treaty here alluded to, at which the king of France assisted, was made in an island of the river Bidassoa which separates France from Spain. Its articles were such as to offend all parties concerned, and in particular to sow the seeds of future dissention between the French and Spanish nations. Those historians, however, may be thought rather too refined who attribute to this celebrated interview the foundation for that enmity between the two countries for which they have been remarkable in modern times. The connexion between the different crowns of Spain, and succession to the crown of Navarre will be best seen from the following table.