 He soon became jealous of the Constable of France, Charles de La Cerda, who was to be a beneficiary of the fiefdom of Angoulême.Charles of Navarre felt he was entitled to these territories as they had belonged to his mother, the Queen of Navarre, but they had been taken from her by the French kings for a paltry sum in compensation.After publicly quarrelling with Charles de la Cerda in Paris at Christmas 1353, Charles arranged the assassination of the Constable, which took place at the village of l'Aigle (8 January 1354), his brother Philip, Count of Longueville leading the murderers.