Gaston of Foix, Prince of Viana Father of King Francis I of Navarre (1444–1470) Parents Leonor I of Navarre Gaston IV of Foix Children Francis Phoebus of Navarre Catherine of Navarre Siblings Joan of Foix, Countess of Armagnac John of Foix, Viscount of Narbonne Giacomo di Foix Catherine of Foix, Countess of Candale Margaret of Foix Marie de Foix Pierre de Foix, le jeune Jeanne (Isabeau) bâtarde de Bearn Partners Magdalena of Valois