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Joanna of Penthièvre or Joanna the Lame (in French Jeanne de Penthièvre, Jeanne la Boiteuse) (1319 – 10 September 1384) was reigning Duchess of Brittany (suo jure) together with her husband Charles of Blois between 1341 and 1364. She was also Countess of Penthièvre in her own right.