Outbreak of the War of the Breton Succession

Timeline

1. 1341Brittany · BrittanyDuke John III died without a recognized male direct heir; his half-brother John of Montfort and Charles of Blois, connected by marriage, both claimed the succession, and the Breton nobility split.
2. 1341–1342Brittany and northern France · BrittanyEdward III recognized John of Montfort as the lawful heir and sent troops to support him, while Philip VI backed his nephew Charles de Blois; armed conflict erupted in full in 1341.
3. 1342–1350Brittany · BrittanyEvents such as the Battle of Morlaix and the Truce of Malestroit followed; John of Montfort was captured and his wife continued resistance, with the war coordinating with the Hundred Years' War, and no final victor had emerged by the 1350s.