France was a very decentralised state during the Middle Ages. 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.[12]

The Carolingian kings had nothing more than a royal title when the Capetian kings added their principality to that title. The Capetians, in a way, held a dual status of King and Prince; as king they held the Crown of Charlemagne and as Count of Paris they held their personal fiefdom, best known as Île-de-France.[12]

The fact that the Capetians held lands as both Prince and King gave them a complicated status. They were involved in the struggle for power within France as princes, but they also had a religious authority over Roman Catholicism in France as King. The Capetian kings treated other princes more as enemies and allies than as subordinates: their royal title was recognised yet frequently disrespected. Capetian authority was so weak in some remote places that bandits were the effective power.[12]

Some of the king’s vassals would grow sufficiently powerful that they would become some of the strongest rulers of western Europe. The Normans, the Plantagenets, the Lusignans, the Hautevilles, the Ramnulfids, and the House of Toulouse successfully carved lands outside of France for themselves. The most important of these conquests for French history was the Norman Conquest of England by William the Conqueror, following the Battle of Hastings and immortalised in the Bayeux Tapestry, because it linked England to France through Normandy. Although the Normans were now both vassals of the French kings and their equals as kings of England, their zone of political activity remained centered in France.[13]

An important part of the French aristocracy also involved itself in the crusades, and French knights founded and ruled the Crusader states. An example of the legacy left in the Middle East by these nobles is the Krak des Chevaliers’ enlargement by the Counts of Tripoli and Toulouse.