1279: Treaty of Amiens and Concessions to England

Under Philip III, foreign policy was often played out through feudal law and inheritance arbitration. The king sometimes had to yield in order to preserve equilibrium — such was the meaning of the Treaty of Amiens (1279), concluded with the king of England Edward I.

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⚖️ A Costly Compromise

The treaty led to territorial concessions in favour of England (notably the Agenais, Saintonge, and Ponthieu). The episode serves as a reminder that Capetian power was not linear: one could gain in 1271 through domain reversions, and lose elsewhere through diplomatic arbitration.

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🧠 Key Points to Remember

• The late thirteenth century was an age of disputes: inheritances, vassalage, treaties.
• The monarchy played on two registers: expansion (domain reversions) and compromise (treaties).