Marker 2In the 11th century, the King's authority was declining. Secular land-owning lords built fortresses to protect their assets and the people for whom they were responsible. The castrum or castle of Le Tournel was built at an altitude of 1,080 m, surrounded by a loop in the river Lot that is impossible to skirt. It occupies a rocky spur surrounded by sheer drops on all sides except the north. The vertical rock faces of the east and west sides make accessing the castle extremely dangerous. The site itself was the mainstay of the castle's defences, and enabled it to dominate and survey the Lot valley.