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John IV
Jan z Montfortu.gif
Citizens of Nantes paying homage to John IV
Preceded by John III
Succeeded by John V
Personal details
Born 1295
Died 16 September 1345(1345-09-16) (aged 50)
Spouse(s) Joanna of Flanders

John IV of Montfort (in Breton Yann Moñforzh, in French Jean de Montfort) (1295 – 16 September 1345[citation needed], Château d'Hennebont), was Duke of Brittany and 6th Earl of Richmond from 1341 to his death. He was the son of Arthur II, Duke of Brittany and his second wife, Yolande de Dreux.

Marriage and issueEdit

In 1322 he succeeded his mother as count of Montfort, and in 1329, he married Joanna of Flanders at Chartres. They had two children:[1]

Breton War of SuccessionEdit

When his half-brother, John III, Duke of Brittany, 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, which in turn became part of the Hundred Years' War. His patron in this quest was King Edward III of England.[2]


See alsoEdit


  1. Jones, Michael, The Creation of Brittany, (The Hambledon Press, 1988), 210.
  2. Previté-Orton, Charles William, The Shorter Cambridge Medieval History, (Cambridge University Press, 1978), 877.
John IV, Duke of Brittany
Born: 1295 Died: 1345
Regnal titles
Preceded by
Count of Montfort
Succeeded by
John V
Preceded by
John III
Duke of Brittany
with Joanna and Charles as rivals
Peerage of England
Preceded by
John III
Earl of Richmond
Succeeded by
John of Gaunt

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