On April 12, 1365, the Treaty of Guérande was signed, ending the War of the Breton Succession. The treaty recognized John of Montfort as Duke of Brittany but required him to pay homage to the French king Charles V. This compromise brought a fragile peace to Brittany and reduced English influence in the duchy, though it remained a contested region.

The Treaty of Guérande was celebrated in Breton and French poetry as a restoration of peace and duchy unity. It appears in the chronicle poetry of the era, which often criticized the war's devastation and praised the settlement. The treaty's themes of compromise and reconciliation influenced later chivalric romances and political allegories in French and English literature.