There has been a church on this site since the 14th century, although two severe fires have caused that it has been rebuilt twice. Much of the present appearance of the church is owing to a restoration carried out in 1904, when the church was decorated attractively in the Art Nouveau style. Much of the interior is embellished with floral motifs including roses. Religious items, including the pulpit and altarpiece, date mainly from the 18th century.
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.