Although it came to be subsumed within the Hundred Years’ War, the ‘Combat of the Thirty’ was really a conflict of the Breton War of Succession, a struggle between the the House of Montfort and House of Blois for control of the Duchy of Brittany. The House of Blois was led by Charles of Blois, who received support from the King of France; the House of Montfort was led by John de Montfort, a French noble with the backing of the English king Edward III. By 1531, the Breton conflict had reached a virtual stalemate. Each side controlled several castles throughout Brittany, and...

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