Blanche of Brittany consort countess of Armagnac (b. 1397) Parents Joan of Navarre John V, Duke of Brittany Children Bonne of Armagnac Siblings Marie of Brittany, Lady of La Guerche Gilles de Bretagne Margaret of Britain John V Arthur III, Duke of Brittany Richard, Count of Étampes Jeanne de Bretagne Partners John IV, Count of Armagnac