Saint-Jean de la Castelle Abbey was established 1073 and moved to the current site around 1140. It was badly damaged in 1568 and 1570 during the French Wars of Religion, Huguenots slaughtered nuns and burned archives and library.
The new abbey was built in 1728-1760, but after Revolution it was secularized and transformed as a farm.
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.