Charles IV, King of France (1322-1327), and as Carlos I, King of Navarre (1322-1327); also count de La marche 1314. The question of succession after his death began the Hundred Years War between England and France. Edward III of England had a claim to the French throne as his mother Isabella was Charles IV’s sister. An assembly of magnates decided in favor of Charles IV’s cousin Philip, Count of Valois, who became Philip VI, King of France.