John III of Brittany died in April 1341 without a legitimate heir, triggering the War of Breton Succession — one of the more destructive regional conflicts of the Hundred Years' War period. This issue dates to the final months of his reign. The SIGNUM DEI VIVI inscription, unusual for a feudal double tournois, reflects a deliberate ecclesiastical posturing at a moment when John was maneuvering politically against rival claimants and attempting to assert the legitimacy of his authority through religious invocation rather than dynastic strength.
John III of Brittany died in April 1341 without a legitimate heir, triggering the War of Breton Succession — one of the more destructive regional conflicts of the Hundred Years' War period. This issue dates to the final months of his reign. The SIGNUM DEI VIVI inscription, unusual for a feudal double tournois, reflects a deliberate ecclesiastical posturing at a moment when John was maneuvering politically against rival claimants and attempting to assert the legitimacy of his authority through religious invocation rather than dynastic strength.