[2] Another of her suitors, Arthur de Montauban was disheartened, and hatched a plot against Gilles, who was imprisoned by his brother the Duke, and killed in 1450.
[2] In 1465, Guy sided with King Louis XI in the feudal conflict that was the War of the Public Weal against the Duchy of Brittany and Charles the Bold.
[5] Charles VIII gave, in 1488, to Count Guy, the government of the city of Dreux and conferred on him the vacant office of Grand Master of France.
[2] Guy XV de Laval did not fulfill the functions of his office or attend the coronation of Louis XII on 27 May 1498, due to his infirmities.
[3] In the same year, Guy inherited the barony of Acquigny from his sister Jeanne de Laval, widow of Rene of Anjou, who had just died.
[2] Guy's only son had died young and the succession fell to his nephew, Nicholas de Laval, Lord of La Roche-Bernard.