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Francis I, Duke of Brittany

Duke of Brittany
The basics
Date of birth Vannes, arrondissement of Vannes, Morbihan, Brittany
Date of death Jul 17, 1450 Nantes, Loire-Atlantique, Pays de la Loire, France
Mother: Joan of France Duchess of Brittany
Father: John VI Duke of Brittany
Spouse: Bonne of Savoy Yolande of Anjou Isabella of Scotland Duchess of Brittany
Brother(s): Peter II Duke of Brittany Gilles de Bretagne
Children: Margaret of Brittany Marie of Brittany Viscountess of Rohan
The details

Francis I (in Breton Fransez I, in French François I) (Vannes/Gwened, 14 May 1414 – 18 July 1450, Château de l'Hermine/Kastell an Ermining), was Duke of Brittany, Count of Montfort and titular Earl of Richmond, from 1442 to his death. He was son of Duke John V and Joan of France.


Francis I's first marriage was to Yolande of Anjou, daughter of Louis II of Anjou; they were married at Nantes in 1431. Francis and Yolande had a son, Renaud, Count of Montfort. Renaud died young and Yolande died in 1440.

His second marriage was to Isabel of Scotland (daughter of James I, King of Scots); he married Isabel at the Château d'Auray on 30 October 1442. Francis and Isabel had two daughters:

  • Margaret of Brittany (1443–1469, Nantes), married Francis II, Duke of Brittany
  • Marie of Brittany (1444–1506), married John II, Viscount of Rohan and Count of Porhoët.


Francis I died in 1450. Because he had no male heirs at the time of his death, he was succeeded by his younger brother, Peter II.


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