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John V, sometimes numbered as VI, (24 December 1389 – 29 August 1442) bynamed John the Wise (Breton: Yann ar Fur ; French: Jean le Sage), was Duke of Brittany and Count of Montfort from 1399 to his death. His rule coincided with the height of the Hundred Years' War between England and France. John's reversals in that conflict, as well as in other internal struggles in France, served to strengthen his duchy and to maintain its independence.
|Duke of Brittany|
Count of Montfort
|Reign||1 November 1399 – 29 August 1442|
|Coronation||28 March 1402|
|Regents||Joan of Navarre|
Philip the Bold
|Born||Peter of Montfort|
24 December 1389
Château de l'Hermine, Vannes
|Died||29 August 1442 (aged 52)|
Manoir de La Touche, Nantes
(m. 1396; died 1433)
|Father||John IV, Duke of Brittany|
|Mother||Joan of Navarre|
His alternative regnal name, John VI, as he is known traditionally in old English sources, comes from English partisan accounting as to who was the rightful duke of Brittany during the War of the Breton Succession (1341–65), which had preceded the rule of his father. Although he faced problems which had lingered from it, his rule as duke was mostly unchallenged. Without significant internal and foreign threats, John V reinforced ducal authority, reformed the military, constructed a coherent method of taxation, and established diplomatic and trade contacts with most of Western Europe.