1365: The Treaty of Guerande and Breton Pacification

Brittany was a dangerous front: ports, English alliances, and chronic warfare made it a strategic priority. For Charles V, stabilizing the west was essential to wider reconquest.

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⚔️ 1363-1364: Renewed War and Auray

Since 1341, the houses of Montfort and Blois had fought for the duchy, with England generally backing Montfort and France backing Blois. In September 1364, at Auray, Jean IV of Montfort and English captains defeated Charles of Blois’ forces; Charles of Blois was killed and Du Guesclin captured.

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⚖️ A Practical Settlement

The Treaty of Guerande (1365) ended the most acute phase of conflict. It:

• reduced military intensity;
• clarified dynastic succession;
• limited direct English leverage in the duchy.

The peace was pragmatic: accept broad Breton autonomy while preventing permanent conversion into an English base.

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🏰 Fewer Fronts, Greater Strategic Coherence

With Brittany partially stabilized, the crown could focus on:

• territories lost after Bretigny;
• internal security against companies;
• methodical warfare.

Jean IV’s homage in 1366 signaled continued French suzerainty without forcing immediate rupture.

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⚠️ A Fragile Peace

Even after Guerande, Brittany remained unstable: maritime access and landing points made it a recurrent theater. The compromise unraveled in the early 1370s as English landings resumed.

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🧠 To Remember

• Guerande (1365) was imperfect but strategically useful.
• Breton stabilization enabled a more coherent royal reconquest.