Saintonge War
In English history, the ‘Hundred Years’ War’ refers to the 116-year period between 1337 – 1453. In some French accounts, that period of conflict is referred to as the ‘Second Hundred Years’ War’, the first embracing the period of upheaval following the change in the balance of power between the French and English thrones from 1159 to 1259 after Henry II of England married Eleanor of Aquitaine gaining many French territories in the process and achieving territorial superiority over the French Kingdom, until the Treaty of Paris (1259), in which the opposite became true. This period saw many conflicts and battles between the two kingdoms such as the Anglo-French War (1202–1214) or the Battle of Bouvines.
Capetian–Plantagenet rivalry
Ironically, Edward III, the son of Isabella and Edward II of England would use his position as grandson of Philip the Fair to claim the Kingdom of France. Therefore, the marriage settlement that sealed the end of the "first" Hundred Years' War would lead to the casus belli employed to declare the "second" Hundred Years' War. The War of Saint-Sardos, the first major conflict between the two major kingdoms in half a century, would act as foreshadowing for the bigger war to come.