The Treaty of Mantes temporarily allied Charles II of Navarre with France, though it failed to prevent him from aligning with England shortly after.
Key Facts
- Date signed
- 22 February 1354
- Parties
- Charles II of Navarre and John II of France
- Title granted to Charles
- Count of Beaumont-le-Roger
- French negotiator
- Robert le Coq
- Subsequent treaty
- Treaty of Valognes (1355)
Location
Cause → Event → Consequence
Charles II of Navarre had begun negotiations with Edward the Black Prince and Henry of Grosmont, alarming John II of France. To prevent a Navarrese alliance with England, John dispatched Robert le Coq to Mantes to secure Charles's loyalty through concessions.
On 22 February 1354, Charles II of Navarre and John II of France affirmed the Treaty of Mantes. John made numerous concessions to Charles, including granting him the title of Count of Beaumont-le-Roger, in exchange for his alliance against England.
The peace proved short-lived. Later in 1354, Charles concluded an alliance with Henry of Grosmont, undermining the treaty's purpose. This forced France into new negotiations, ultimately resulting in the Treaty of Valognes the following year.
Political Outcome
Charles II received the title Count of Beaumont-le-Roger and other concessions, but subsequently allied with England, rendering the treaty ineffective.
Charles II negotiating with England, threatening French strategic interests
Temporary French-Navarrese alignment, soon broken by Charles's alliance with Henry of Grosmont