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Notre-Dame de Saint-Bertrand-de-Comminges Cathedral was the cathedral of the diocese of Comminges until 1801, when Pope Pius VII issued the bull Qui Christi Domini dividing the territory of the diocese of Comminges between the archdiocese of Toulouse and the diocese of Bayonne. The cathedral is located on the acropolis of a Celtic oppidum which gave birth to the Roman city of Lugdunum Convenarum, whose ruins stretch across the plain. The invasion of the Vandals in 409 devastated it. The city disappeared in 585 following a conflict between Gondovald, claiming to be the natural son of Clotaire I and King Gontran. It was not until Bertrand de l'Isle, a member of a noble family and canon of Toulouse, appointed bishop of Comminges in 10832, that the city recovered. He re-established community life in the chapter, raised the cathedral and built its cloister. He died in 1123. Recognised as a saint by the crowd of pilgrims at the tomb of Saint Bertrand, he was only recognised as a saint under the pontificate of Clement V. The influx of pilgrims necessitated the enlargement of the cathedral in the second half of the 18th century. The bell tower was built in the 12th century inside the nave.

Saint-Brieuc Cathedral or Saint-Etienne Basilica-Cathedral was built between the 12th and 15th centuries to house the relics of Saint-Brieuc (5th century), a Breton monk from Wales who became the first bishop of Saint-Brieuc. Many important restorations and works took place in the 19th and 20th centuries, including repairs to the vault and work on the stained glass windows.

Church built in the 12th century first intended to be the Chapel of the castle of the lords. A new church was built two to three centuries later on top of the previous one.

The cathedral was formerly a church belonging to the abbey of Saint-Claude. The abbey had three churches, only St. Peter's Cathedral was preserved. The building became a cathedral in 1742, after the creation of a diocese in Saint-Claude.

Church entirely rebuilt in 1358 following a fire. Enlarged in the 15th century, it was in the 16th century that it really adopted its current appearance.

Saint-Étienne-du-Mont Church was built at the end of the 15th century on the site of a 13th-century church, but its rich Renaissance façade was not completed until 1624. Until the French Revolution, the church housed the relics of Sainte Geneviève, patron saint of Paris. The church also houses an organ from the 1630s.

The origins of the church of Saint-Eustache go back to the beginning of the 13th century. A chapel dedicated to Saint Agnes was the first building to be constructed. A crypt bearing this name is still attached to the church on the east side. In 1223, Sainte Agnès was erected as a parish and took the name of Saint-Eustache. The construction of the present church, however, only began in 1532 and lasted until 1633. The church was then partially rebuilt in 1754. Many Parisian personalities are buried in the church cemetery, among them Marie de Gournay (1565 - 1645), one of the few women to live from writing in Europe at that time. Her famous writings include "L'égalité des hommes et des femmes" (1622).

Situated in the heart of the town of Saint-Flour (Cantal), on the Place d'Armes lined with arcades and towards which many old streets converge. Like many religious buildings in the region, the black volcanic stone of Liozargues gives it a characteristic dark colour.

The church of St. Francis Xavier was built between 1852 and 1875. After suffering major damage in 2001 during the explosion of the AZF factory, it reopened in 2003. Stained glass windows illustrating the life of St. François-Xavier are worth the detour.

The church is part of an old Benedictine royal abbey dating from the 6th century. The building was rebuilt by Abbot Morard in the 10th century. The current choir was built in the middle of the 12th century and consecrated by Pope Alexander III. Conventual buildings successively rebuilt during the 13th century. After the Revolution, the church lost its status as an abbey church to become a parish abbey. Reconstructions carried out between 1821 and 1854. Church classified as a historical monument by list in 1862. Remains of the former abbey classified in 1953. Saint-Germain-des-Prés church is the oldest of the great Parisian churches.