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Joan of Brittany, Baroness of Drayton (1341 – aft. 20 October 1399), married before 21 October 1385 to Ralph Basset, 4th Baron Basset de Drayton - born at the onset of the Breton War of Succession
During the Breton War of Succession (1341–1364), the garrison of Josselin fought inconclusively the defenders of the nearby Castle of Ploërmel.
John IV, Duke of Brittany (1294-1345), contested Duke of Brittany, one of two sides in the Breton War of Succession
The Second Breton War of Succession pitted the supporters of two different claimants against one another: those of the half-brother of the deceased John III, Duke of Brittany, Jean de Montfort, who relied on the Estates of Brittany who gathered in Nantes, and those of Charles I, Duke of Brittany, who was supported by King Philippe VI of France and was recognized as Duke of Brittany by the peers of the kingdom.