St. Catherine Church has undergone numerous changes over the centuries. It was originally built around the end of the 13th century, in the Occitan Gothic style; several 13th century features remain, such as the holy water stoup. It formed part of the defensive system of town walls and was at the entrance to the village.
During the Wars of Religion in the 16th century, the building was badly damaged, and the church bells were thrown into a well (but they were later retrieved and one was able to be restored).
It was re-roofed and restored during the reign of Henry IV (1589-1610).
Each century since has seen intermittent efforts to restore and improve the church, including a major re-orientation of the building in 1876.
References: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.