Dual soveriegnty of the kings of england as a cause of the hundred years war.

In 1259, Henry II of England and Louis IX signed a peace treaty in Paris bringing to end a state of warfare that had existed between the two countries since 1180. In doing so they had laid a cornerstone to a further 250 years of dynastic and feudal conflict between the two countries and the Hundred Years War. By including within its writing's the demand for liege homage to be paid by the King/Duke of England to …

…the situation in 1337 which started off one hundred years of warfare. However the developing dynastic claims of Edward III and the need to produce a final answer with reference to Scotland also precipitated the events that followed, making the Hundred Years War more than a war between vassal and liege but the struggle to carve out separate identities for England and France and the rise of one country over another as the dominant European power.