John V ruled Brittany from 1399 until his death in 1442, navigating the duchy through the final convulsions of the Hundred Years' War with calculated neutrality — playing English and French interests against each other long enough to extract the Treaty of Guérande's protections in practical form. This billon issue falls within that late period, when Breton ducal coinage was asserting monetary independence from the French royal system with unusual confidence for a nominally subordinate lordship.
The wide reference spread across Jezierski's varieties reflects genuine die diversity in this type, likely tied to multiple mint operations across the duchy rather than a single centralized striking.
John V ruled Brittany from 1399 until his death in 1442, navigating the duchy through the final convulsions of the Hundred Years' War with calculated neutrality — playing English and French interests against each other long enough to extract the Treaty of Guérande's protections in practical form. This billon issue falls within that late period, when Breton ducal coinage was asserting monetary independence from the French royal system with unusual confidence for a nominally subordinate lordship.
The wide reference spread across Jezierski's varieties reflects genuine die diversity in this type, likely tied to multiple mint operations across the duchy rather than a single centralized striking.