Initially, West Frankish kings were elected by the secular and ecclesiastic magnates, but the regular coronation of the eldest son of the reigning king during his father's lifetime established the principle of male primogeniture, later popularized as the Salic law. The authority of the king was more religious than administrative. The 11th century in France marked the apogee of princely power at the expense of the king when states like Normandy, Flanders or Languedoc enjoyed a local authority comparable to kingdoms in all but name. The Capetians, as they were descended from the Robertians, were formerly powerful princes themselves who had successfully unseated the weak and unfortunate Carolingian kings.