Robert Curthose Duke of Normandy (1054–1134) Parents Matilda of Flanders William the Conqueror Children William Clito Richard de Normandie William, Lord of Tortosa Henry de Normandie Siblings Henry I of England Cecilia of Normandy Constance of Normandy William II of England Richard of Normandy Adela of Normandy Adeliza Matilda of Normandy Agatha of Normandy Alberta Partners Sybilla of Conversano Margaret de Maine
