Joan of Foix, Countess of Armagnac Countess Consort of Armagnac (1454–1476) Parents Leonor I of Navarre Gaston IV of Foix Children Siblings Marie de Foix Pierre de Foix, le jeune Gaston of Foix, Prince of Viana Margaret of Foix Catherine of Foix, Countess of Candale Giacomo di Foix John of Foix, Viscount of Narbonne Jeanne (Isabeau) bâtarde de Bearn Partners John V, Count of Armagnac