He sowed dissension between Henry II and his sons, Richard (The Lion Heart) and John Lackland.

> 1202 : Using feudal legal arguments, Philippe-Auguste proclaimed the confiscation of all the continental lands belonging to John Lackland.

> 6th of March, 1204 : The King of France seized Château Gaillard, a strategic point of the dukedom, on the Seine River.

> 24th of June, 1204 : The Capitulation of Rouen to the King of France. This marks the end of the Anglo-Norman state. Only the islands of Jersey, Guernsey, Sark and Aurigny, forgotten in the peace treaties, remained under English sovereignty.

The English kings tried for a long time to restore Normandy to English rule, and the Normans hesitated between France and England : "You can’t serve two masters at once. Between Henri and me, you must choose! " said Louis IX on a visit to Normandy and Cherbourg in 1256.

At the end of the 13th century, all the while preserving its unity and pronounced individuality, Normandy accepted the change of sovereignty.