San Pietro e San Paolo is a Romanesque-style church built in the 9th to 10th century, although the present structure was heavily reconstructed in the 19th century. The façade is not decorated with three entrances, one for each nave. These are separated by columns from a prior temple. Under the presbytery is a crypt. Most of the frescoes of the church are lost, but the adjacent 9 sided baptistery will retains frescoes from the 14th century and earlier. The present bell-tower was added in the late 19th century.
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.