1353–1355: The Murder of La Cerda and the Treaties of Mantes/Valognes
p5John II the Good: Captivity, Internal Crisis, and the Treaty of Brétigny (1350–1364) · HIGH MIDDLE AGES
Between 1353 and 1355, the Navarrese crisis tips into open violence. The royal favorite becomes the target, then diplomacy forces humiliating concessions on the king of France. This sequence shows the weakness of a state at war: the monarchy must avoid internal dissolution as much as external enemies.
🤝 1353: Brittany, Negotiations, and Maneuver
The Breton file weighs on the balance: under diplomatic pressure, negotiations involve English, French, and Bretons. Charles of La Cerda participates in discussions, while Charles II of Navarre is kept at the margins, which threatens his strategy: a Franco-English peace would reduce his alliance options.
🗡️ January 8, 1354: Murder of Charles of La Cerda
On January 8, 1354, Charles of La Cerda is murdered at L’Aigle by men linked to the king of Navarre. Charles II assumes political responsibility for the act and justifies it as a matter of honor. For John II, it is a shock: his favorite is struck down, and royal authority appears impotent to protect those close to him.
✍️ February 22, 1354: Treaty of Mantes
The Normandy crisis and the threat of conflagration force John II to compromise. The Treaty of Mantes (February 22, 1354) grants Charles of Navarre important lands and prerogatives in Normandy, to the point of giving him levers comparable to those of a duke, without the title.
The Navarrese obtains notably places and rights that reinforce his autonomy, up to maritime strongholds like Cherbourg. For the king of France, it is a strategic concession: it avoids immediate coalition, but it weakens unity of command in Normandy.
A lit of justice confirms the arrangement: the political sanction is minimal given the assassination’s gravity.
⚔️ 1354–1355: Plots, Arrests, New Concessions
Trust is broken. Tensions continue: appeals to external support, neutralization attempts, displacements, arrest of Philip of Navarre (1355), and rearmament of Norman places. Finally, the Treaty of Valognes (September 10, 1355) reaffirms the compromise logic: the king validates the essence of Mantes, failing to impose a forceful solution.
🧠 To Remember
- 1354: La Cerda’s assassination tips the crisis into political violence.
- Mantes and Valognes show a monarchy constrained to negotiate under internal pressure.