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John (Duke of Brittany Six princes)

Duke of Brittany. Six princes of this name have worn the ducal crown, but only two are important: JOHN IV. commonly known as John de Montfort, -whose cause was espoused by the English. When made prisoner by the French, he had his rights vigorously maintained by his heroic wife, who bravely held out her castle against the large force that encompassed it till the JOHN OF GAUNT