Hundred Years' War
Historians commonly divide the war into three phases separated by truces: the Edwardian War (1337–1360), the Caroline War (1369–1389), and the Lancastrian War (1415–1453). Local conflicts in neighbouring areas, which were contemporarily related to the war, including the War of the Breton Succession (1341–1365), the Castilian Civil War (1366–1369), the War of the Two Peters (1356–1369) in Aragon, and the 1383–85 crisis in Portugal, were availed by the parties to advance their agendas. Later historians adopted the term "Hundred Years' War" as a historiographical periodisation to encompass all of these events, thus constructing the longest military conflict in European history.
Abbey of Saint-Vigor de Cerisy
In 1337, the dynastic rivalries between the Valois and the kings of England precipitated the country into the Hundred Years War, which plunged the country into misery, aggravated by epidemics of plague. The abbey was fortified and a garrison settled there. In 1418, Richard de Silly, knight and captain of the abbey, was obliged to cede the abbey to the King of England. However, after the victory of the constable de Richemont over the English at Formigny in 1450, Normandy returned definitively to the kingdom of France.