John IV, Duke of Brittany

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.

John IV
Drawing c.1700 of English-made effigy, on white arcaded chest tomb, Nantes Cathedral. Original monument destroyed. Drawing by Roger de Gaignières.
Duke of Brittany
Reign12 April 1365 – 1 November 1399
PredecessorJoan, Duchess of Brittany, contested by John (IV)
SuccessorJohn V
Count of Montfort
Reign16 September 1345 – 1 November 1399
PredecessorJohn II
SuccessorJohn IV
Earl of Richmond
Reign20 June 1372 – 1 November 1399
PredecessorJohn of Gaunt
BornSeptember–December 1339
Died1 November 1399 (aged 59–60)
Nantes, Brittany
Burial
Nantes Cathedral
Spouses
Mary of England
(m. 1361; died 1361)
    (m. 1366; died 1384)
      (m. 1386)
      Issue
      full list...
      FamilyMontfort
      FatherJohn of Montfort
      MotherJoanna of Flanders
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