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John IV of Montfort (in Breton Yann Moñforzh, in French Jean de Montfort) (1295 – 16 September 1345[citation needed], Château d'Hennebon), 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.
In 1322 he succeeded his mother as count of Montfort, and in 1329, he married Joanna of Flanders at Chartres. They had two children:
- John V, Duke of Brittany (1339-1399)
- Jeanne de Bretagne (1341 – aft. 20 October 1399), married before 21 October 1385 Ralph Basset, 4th Baron Basset de Drayton
Breton War of Succession
When his half-brother, duke John III, died with no male heirs in 1341, John IV decided to contest the rights of his niece Joanna of Penthièvre and her husband Charles of Blois to the duchy of Brittany. This led to the Breton War of Succession part of the Hundred Years' War. His patron in this quest was king Edward III of England.
See also
References
| Regnal titles | ||
|---|---|---|
| Preceded by Yolande |
Count of Montfort 1322 – 1345 |
Succeeded by John V |
| Preceded by John III |
Duke of Brittany disputed with Joanna and Charles 1341 – 1345 |
|
| Peerage of England | ||
| Preceded by John III of Dreux |
Earl of Richmond 1341 – 1342 |
Succeeded by John of Gaunt |
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