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Francis I (in French François I) (1414 ? 1450), was duke of Brittany, from 1442 to his death. He was son of Duke John VI and Jeanne de Valois, princess of France. Francis married Isabella Stuart, princess of Scotland (daughter of James I) and had two daughters:
See also: Dukes of Brittany family tree
| Preceded by: John VI | Duke of Brittany | Succeeded by: Peter II |