Joan, Duchess of Brittany

Joanna of Dreux (in French Jeanne de Dreux, la Boiteuse) (1319-1384) was countess of Penthievre and nominal Duchess of Brittany during the Breton War of Succession. Joanna was the only daughter of Guy de Dreux, count of Penthievre, niece and heiress of duke John III de Dreux.

In 1337, she married Charles of Blois in Paris and in 1341 on the death of John III, the couple assumed their pretension to the duchy of Brittany. However, John of Dreux, born from the second marriage of duke Arthur II to Yolande de Montfort, did not agree of let go his own rights. The result was the Breton War of Succession, which would end in 1364 with the death of Charles of Blois in battle and the victory of the Montfort branch.

Preceded by: John III

Duchess of Brittany with Charles disputed with John IV

Succeeded by: John V

See also: Dukes of Brittany family tree