Isabeau de Coucy 1166 - (b. 1166) Parents Ralph I, Lord of Coucy Agnes of Hainaut Children Henri IV of Grandpré Siblings Enguerrand III, Lord of Coucy Ade de Coucy Yolande de Coucy Thomas II de Coucy Agnès de Coucy Robert de Coucy Partners Henri III of Grandpré Raoul Ier de Roucy