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Charles de Blois, son of Guy I, Count of Blois, married Joan of Penthievre, the heiress of John III, Duke of Brittany; together, they became principal protagonists in the War of the Breton Succession.
Contemporary European conflicts directly related to this conflict were the War of the Breton Succession, the Castilian Civil War, the War of the Two Peters, and the 1383–85 Crisis.