The Hundred Years' War began in approximately 1337, marking the start of a protracted and transformative conflict between England and France. At its core, the war was driven by competing claims to the French throne and disputes over the control of valuable territories held by the English crown within France. This struggle for dynastic legitimacy and land served as a primary catalyst for political and social upheaval throughout the late medieval period.

The conflict was far more than a simple territorial dispute; it became a defining feature of the era, deeply influencing the evolution of royal authority and the development of national identity in both nations. As the war persisted, it necessitated significant changes in government administration, military organisation, and the taxation systems required to fund such extensive campaigns. These developments fundamentally altered the relationship between the monarchy and its subjects, leaving a lasting mark on the structure of medieval society.

The war serves as a critical lens through which to examine the broader shifts occurring in Late Medieval Britain. The pressures of sustained warfare influenced not only the political landscape but also the religious and social fabric of the country, as the demands of the state increasingly intersected with the lives of the population. Understanding this period is essential for grasping how England transitioned through these centuries of instability and growth.

• The conflict was triggered by rival claims to the French crown.
• Control over English-held territories in France remained a central point of contention.
• The war significantly impacted the development of national identity.
• It forced major changes in government, taxation, and military strategy.
• The period serves as a vital reference point for understanding medieval societal change.