Sainte-Marie-Madeleine Priory was founded in 1090-1097. The church, built in two stages between the 11th and 12th centuries, was initially dedicated to Saint Sulpice, later to St. Mary Magdalene. It was also used as a parish church in the Middle Ages and was flanked by a priory buildings, now destroyed. The church passed to Protestants following the Bernese conquest of 1536.
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.