The Church of St. Peter was officially consecrated in 1198. The part in white and black bands dating from the 13th century (probably made between 1256 and 1277), and was restored between 1931 and 1935. This part was derived from an older body, which consists of the early church, but left the bell tower is based on the chapel left of the presbytery.
The original church dates from the 5th century, in Syriac type, with rectangular plan and semicircular apse. It lost the title of parish in the late 14th century, in favor of the Church of San Lorenzo. It was officiated by the secular clergy until 1798.
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.