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John remained single throughout his life and died with no male heirs. His death triggered the Breton War of Succession ( 1341- 1364), which opposed the House of Blois and the rights of his niece Joanna of Dreux, to the House of Monfort, a cadet branch of the ducal family of Brittany, lead by John of Montfort and his homonymous son. This civil war was an incident of the Hundred Years War.
See also: Dukes of Brittany family tree
| Preceded by: Arthur II | Duke of Brittany | Succeeded by: John IV or Joanna and Charles |