1294–1303: Occupation of Guyenne and Prelude to the Hundred Years' War

The seizure and occupation of Guyenne (Aquitaine) by Philip IV initiates a long sequence of Franco-English conflict that anticipates the Hundred Years’ War (1337–1453).

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🏰 Guyenne’s Status

Guyenne—the vast Aquitanian patrimony—has been under English control since Henry II via his marriage to Eleanor of Aquitaine. By 1294, it represents the English king’s most valuable continental possession. French royal authority in the region remains contested.

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🔨 1294: The Seizure

Using maritime incidents as pretext, Philip IV pronounces the seizure of the Duchy of Aquitaine on May 19, 1294. The action is dramatic: the king claims Guyenne as forfeit for English violations of his sovereignty.

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💥 The War of Guyenne (1294–1299)

A prolonged conflict follows. Edward I of England resists; alliances with Flanders and Scotland complicate the picture. The war is costly for both sides and economically damaging to the region.

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🕊️ The Treaty of Montreuil (1299)

By the Treaty of Montreuil-sur-Mer (1299), Philip the Fair restores Guyenne to the English king in exchange for recognition of French rights and an indemnity. However, tensions persist, and English recovery of the region proves temporary.

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📍 Long-Term Significance

The seizure and subsequent disputes over Guyenne establish a pattern: French monarchs can and will challenge English holdings in France. This sets the stage for the Hundred Years’ War, when Edward III of England (grandson of Philip IV through his mother) will claim the French throne and re-open the conflict.

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🧠 Key Points to Remember

• The War of Guyenne demonstrates the fragility of English continental possessions.
• Conflicts over Guyenne foreshadow the Hundred Years’ War’s origins.