Marie de Foix Marchioness Consort of Montferrat (1452–1467) Parents Leonor I of Navarre Gaston IV of Foix Children Giovanna of Montferrat Siblings Margaret of Foix Joan of Foix, Countess of Armagnac John of Foix, Viscount of Narbonne Giacomo di Foix Catherine of Foix, Countess of Candale Pierre de Foix, le jeune Gaston of Foix, Prince of Viana Jeanne (Isabeau) bâtarde de Bearn Partners William VIII, Marquess of Montferrat