Chillon Castle is an island castle located on Lake Geneva to the south of Veytaux in Vaud, Switzerland. It is situated at the eastern end of the lake, on the narrow shore between Montreux and Villeneuve, and close to the Fort de Chillon, which is embedded in the neighbouring hillside. The oldest parts of the castle have not been dated definitively, but the first written record of the castle was in 1005. It was built to control the road from Burgundy to the Great St Bernard Pass, on the site of an earlier Roman outpost. From the mid 12th century, the castle became the summer home of the Counts of Savoy, who kept a fleet of ships on Lake Geneva. It was greatly expanded during the 13th century. The castle became a prison in the 16th century, housing among others the Genvois monk François Bonivard, before reverting to being a residence and then again becoming a prison in 1733. Since the end of the 18th century, the castle has been a tourist attraction.Photograph credit: Giles Laurent