John IV of Montfort, duke of Brittany (d. 1399)

John IV of Montfort, duke of Brittany (1365-1399), sometimes referred to as John V, the Conqueror. Through this marriage he was related to the English royal family. He remained devoted to the English cause. He owed his position to the victory won at Auray in 1364, and to the subsequent treaty of Guérande the following year.

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