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.
History of Hertfordshire
Hertford Castle was used as a gaol for a series of important captives during the Hundred Years' War. This was actually a series of separate wars that lasted a total of 116 years, between 1337 and 1453. The Plantagenet Kings of England fought the Valois Kings of France, almost entirely on French soil. Queen Isabella was imprisoned by her son, the King, in Hertford Castle in 1330, as were King David II of Scotland and his queen in 1346, after the Battle of Neville's Cross. King John II of France was imprisoned there in 1359 in considerable luxury.