Jean IV de Montfort 1884
- Born: 1295 1884
- Marriage (1): Joanna of Flanders in 1329 in Chartres, Bretagne, France 1884
- Died: 16 Sep 1345 at age 50 1884
 General Notes:
John IV of Montfort (in French Jean IV de Montfort) (1295 - September 16, 1345), was duke of Brittany, from 1341 to his death. He was son of Duke Arthur II and Yolande de Dreux, countess of Montfort, his second wife. From his mother he became count of Montfort.
When his half-brother, duke John III, died with no male heirs in 1341, John decided to fight the rights of his niece Joanna of Dreux and her husband Charles of Blois to the duchy of Brittany. This lead to the Breton War of Succession an event of the Hundred Years War. His patron on this quest was king Edward III of England. John IV died without accomplishing his objective of becoming sole ruler of Brittany, but his wife Joanna of Flanders continued the fight in the name of their son John V who eventually won the Succession War. 1884
Life Events:
1. Acceded: Duc de Bretagne, 1341. 1884
Jean married Joanna of Flanders in 1329 in Chartres, Bretagne, France.1884 (Joanna of Flanders was born in 1295 1884 and died in 1374 1884.)
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