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.
Richard of York, 3rd Duke of York
As York reached majority, events were unfolding in France which would tie him to the events of the ongoing Hundred Years' War. In the spring of 1434, York attended a great council meeting at Westminster which attempted to conciliate the king's uncles, the dukes of Bedford and Gloucester (heads of the regency government), over disagreements regarding the conduct of the war in France. Henry V's conquests in France could not be sustained forever, as England either needed to conquer more territory to ensure permanent French subordination, or to concede territory to gain a negotiated settlement. During Henry VI's minority, his Council took advantage of French weakness and the alliance with Burgundy to increase England's possessions, but following the Treaty of Arras of 1435, Burgundy ceased to recognise the English king's claim to the French throne.