The Château de Lignières was built in 1654–1660 for the financier Jérôme de Nouveau. The feudal castle on the site was razed in 1653 and François Le Vau constructed the new building on the foundations of the old and retained the old moat and its defensive wall (fausse braye). His designs for the château are preserved in four engravings by Claude Olry de Loriande.
The new corps de logis was built from 1654 to 1656. It was connected to two end pavilions by curved façades.
The Château de Foix dominates the town of Foix. An important tourist site, it is known as a centre of the Cathars. Built on an older 7th-century fortification, the castle is known from 987. In 1002, it was mentioned in the will of Roger I, Count of Carcassonne, who bequeathed the fortress to his youngest child, Bernard. In effect, the family ruling over the region were installed here which allowed them to control access to the upper Ariège valley and to keep surveillance from this strategic point over the lower land, protected behind impregnable walls.
In 1034, the castle became capital of the County of Foix and played a decisive role in medieval military history. During the two following centuries, the castle was home to Counts with shining personalities who became the soul of the Occitan resistance during the crusade against the Albigensians.