Guy of Thouars French nobleman, Duke of Brittany jure uxoris (d. 1213) Parents NN Geoffroy IV of Thouars Children Pierre I de Chemillé, Sire de Chemille et de Mortagne Catherine of Thouars Alix, duchess of Brittany Margaret of Thouars Siblings Raymond I of Thouars Aimery VII of Thouars Hugh I of Thouars Partners Constance, duchess of Brittany Eustachie of Chemillé