William, Count of Luxembourg first of his family to use the title count of Luxembourg in his documents (1081–1131) Parents Clementia of Aquitaine Conrad I, Count of Luxembourg Children Wilhelm von Gleiberg Conrad II, Count of Luxembourg Liutgard von Luxemburg Siblings Judith of Guelders Henry III, Count of Luxembourg Ermesinde of Luxembourg, Countess of Namur Gerard II, Count of Guelders Matilda of Luxembourg Yolande de Wassenberg Partners Liutgard of Northeim
