John VI (in French Jean VI) (December 24 1389 – August 29 1442), known as the Wise, was duke of Brittany, from 1399 to his death. He was son of Duke John V and Jeanne d'Albret, princess of Navarre. John VI married Jeanne de Valois, princess of France, daughter of king Charles, the Mad.
Unlike his father, John VI was a peaceful man, or so the end of the Breton War of Succession permitted him to be so. He thrived to reinforce ducal authority, by levying a permanent army and constructing a coherent method of taxation in Brittany. John VI was also a patron of the Arts and the Church and funded the construction of several cathedrals.
See also: Dukes of Brittany family tree
