John IV | |
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![]() Drawing c.1700 of English-made effigy, on white arcaded chest tomb, Nantes Cathedral. Original monument destroyed. Drawing by Roger de Gaignières.[1] | |
Duke of Brittany | |
Reign | 12 April 1365 – 1 November 1399 |
Predecessor | Joan, Duchess of Brittany, contested by John (IV) |
Successor | John V |
Count of Montfort | |
Reign | 16 September 1345 – 1 November 1399 |
Predecessor | John II |
Successor | John IV |
Earl of Richmond | |
Reign | 20 June 1372 – 1 November 1399 |
Predecessor | John of Gaunt |
Born | September–December 1339[2] |
Died | 1 November 1399 (aged 59–60) Nantes, Brittany |
Burial | |
Spouses | |
Issue full list... |
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Family | Montfort |
Father | John of Montfort |
Mother | Joanna of Flanders |
John IV the Conqueror KG (in Breton Yann IV, in French Jean IV, and traditionally in English sources both John of Montfort and John V) (1339 – 1 November 1399), was Duke of Brittany and Count of Montfort from 1345 until his death and 7th Earl of Richmond from 1372 until his death.