Joan of Savoy (1392-1460) (1392–1460) Parents Bonne of Berry Amadeus VII, Count of Savoy Children Amadea Palaiologina of Montferrat John IV, Marquess of Montferrat Isabella Palaiologina of Montferrat William VIII, Marquess of Montferrat Boniface III Teodoro Paleologo di Montferrato Siblings Mary of Armagnac Beatrix of Armagnac Jeanne of Armagnac Bona di Savoia Bernard d'Armagnac, Count of Pardiac John IV, Count of Armagnac Amadeus VIII of Savoy Bonne of Armagnac Anne of Armagnac Humbert de Savoie Partners John Jacob, Marquess of Montferrat