John VI, Duke of Brittany
| John V | |
|---|---|
 |
|
| Duke of Brittany; Count of Montfort | |
| Reign | 1 November 1399 – 29 August 1442 |
| Coronation | 28 March 1402 |
| Predecessor | John IV |
| Successor | Francis I |
| Born | 24 December 1389 Château de l'Hermine |
| Died | 29 August 1442 (aged 52) Manoir de La Touche |
| Burial | Notre |
| Spouse | Joan of France |
| Issue | Anne Isabelle, Countess of Laval Margaret Francis I, Duke of Brittany Catherine Peter II, Duke of Brittany Gilles, Lord of Chantocé |
| House | House of Montfort |
| Father | John IV |
| Mother | Joan of Navarre |
| Religion | Roman Catholicism |
John V the Wise (in Breton, Yann V ar Fur, in French Jean V le Sage, and traditionally in English sources John VI) (24 December 1389 – 29 August 1442), was duke of Brittany, count of Montfort, and titular earl of Richmond, from 1399 to his death. He was son of Duke John IV (Jean IV) and Joan of Navarre.
John V became Duke of Brittany in 1399 when still a minor upon the death of his father, John IV. His mother, Joan of Navarre, served as regent in the initial portion of his reign.
Unlike his father, John V inherited the duchy in peace, or so the end of the Breton War of Succession and John IV's military conquests in Brittany promised. However, his father's rivals for the duchy, the Pentheiveres, continued to plot against him. Furthermore, John had to secure the peace of the duchy during an unstable period culminating in Henry V of England's invasion of France.
He became duke at the age of ten, and began his reign under the tutelage of Duke of Burgundy, Philip the Bold, who was ravaging nearby Jersey and Guernsey. He made peace with the king of France, Charles VI, whose daughter, Joan of France, he married. He also reconciled with the powerful magnate Olivier de Clisson, formerly an enemy of his father. In 1404, he defeated a French force near Brest. A potential conflict with Clisson was averted by the latter's death.
When Henry V invaded France, John was initially allied to the French. However, he missed the Battle of Agincourt. The confusion in the aftermath of the battle allowed him to seize Saint-Malo which had been annexed by the French. He then adopted a policy of switching between the two parties, English and French. He signed the Treaty of Troyes, which made Henry V heir to France, but he allowed his brother Arthur de Richemont to fight for the French. Arthur was imprisoned by the English.
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