John IV, Duke of Brittany

From Wikipedia, the free encyclopedia
  (Redirected from John de Montfort)
Jump to: navigation, search
John IV
Jan z Montfortu.gif
Citizens of Nantes paying homage to John IV
Duke of Brittany
Reign 1341–1345
Predecessor John III
Successor John V
Spouse Joanna of Flanders
House House of Dreux
Father Arthur II, Duke of Brittany
Mother Yolande de Dreux
Born 1295
Died 16 September 1345(1345-09-16) (aged 50)

John of Montfort (in Breton Yann Moñforzh, in French Jean de Montfort) (1295 – 16 September 1345[citation needed], Château d'Hennebont), was John IV, 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 issue[edit]

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]

War of the Breton Succession[edit]

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, Joan of Penthièvre, and her husband, Charles of Blois, to the Duchy of Brittany. This led to the War of the Breton Succession, which in turn became part of the Hundred Years' War. His patron in this quest was King Edward III of England.[2]


See also[edit]


  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