<P> Charles IV died in 1328, leaving a daughter and a pregnant wife . If the unborn child was male, he would become king; if not, Charles left the choice of his successor to the nobles . A girl ended up being born, therefore rendering the main male line of the House of Capet extinct . </P> <P> By proximity of blood, the nearest male relative of Charles IV was his nephew Edward III of England . Edward was the son of Isabella, the sister of the dead Charles IV, but the question arose whether she should be able to transmit a right to inherit that she did not herself possess . The French nobility, moreover, balked at the prospect of being ruled by Isabelle and her lover Roger Mortimer, who were widely suspected of having murdered the previous English king, Edward II . The assemblies of the French barons and prelates and the University of Paris decided that males who derive their right to inheritance through their mother should be excluded . Thus the nearest heir through male ancestry was Charles IV's first cousin, Philip, Count of Valois, and it was decided that he should be crowned Philip VI . In 1340 the Avignon papacy confirmed that under Salic law males should not be able to inherit through their mothers . </P> <P> Eventually, Edward III reluctantly recognized Philip VI and paid him homage for his French fiefs . He made concessions in Guyenne, but reserved the right to reclaim territories arbitrarily confiscated . After that, he expected to be left undisturbed while he made war on Scotland . </P> <P> Tensions between the French and English monarchies can be traced back to the 1066 Norman conquest of England, in which the English throne was seized by the Duke of Normandy, a vassal of the King of France . As a result, the crown of England was held by a succession of nobles who already owned lands in France, which put them among the most powerful subjects of the French king, as they could now draw upon the economic power of England to enforce their interests in the mainland . To the kings of France, this dangerously threatened their royal authority, and so they would constantly try to undermine English rule in France, while the English monarchs would struggle to protect and expand their lands . This clash of interests was the root cause of much of the conflict between the French and English monarchies throughout the medieval era . </P>

Where did the 100 years of war take place