The first fortified castle was built by the count of Blois at the end of the tenth century, immediatly taken by The Count of Anjou, Fulk Nerra, took the fortress in 1001 and incorporated it to Anjou. Fulk, who was one of the first great builders of Medieval castles, modified it, and the fortress remained under the control of Anjou, never taken, during more than 150 years. 