The Château de Comper is a castle located in Paimpont forest (formerly known as Brocéliande), three kilometers to the east of the village of Concoret in the département of Morbihan in the region of Brittany, France. It has been rebuilt as a château.
The name Comper, like Quimper, probably comes from the Breton word kemper, which means confluence. The castle is surrounded by several streams and lakes.
The first owner of Comper is sometimes said to have been Salomon, king of Brittany in the 9th century. However the castle is seen in recorded history with the baron Raoul de Gaël-Monfort, who was a companion of William of Normandy during the Norman conquest of England.
The castle is listed as a monument historique by the French Ministry of Culture.
The castle was originally square, with towers at each of the four corners, linked by strong curtain walls. At the main door was a drawbridge. Now the moat is dry and the castle houses the exhibitions of the "Centre de l’imaginaire arthurien", about the Arthurian legend.
The large pond is related to Viviane, the Lady of the Lake. In the legend, she lives in a crystal palace, built by Merlin, hidden under the waters of the lake.