sentences:  It is listed as a "monument historique" by the French Ministry of Culture and is open to the public.The 10th century saw the emergence of the castle, which is generally thought to be the second-earliest known, the earliest being Château de Doué-la-Fontaine built by the Count of Blois around 900.The counts of Anjou and Blois had bordering territories and the powerful lords were rivals; as a result the border area is home to some of the earliest-known castles.