As early as the 11th century, two chapels, Saint-Pierre and Saint-Sauveur, were built outside the walls of the enclosed town of Bellême.

During the Wars of Religion, the chapel of Saint-Sauveur was destroyed by the troops of Gaspard II de Coligny in 1562 and 1572; the church was almost entirely rebuilt at the end of the 16th century.

On March 31, 1789, when the Estates General were convoked, the assembly of the three orders of the province of Perche met for a solemn mass in the church of Saint-Sauveur before going to deliberate.

[13] The porch bell tower on the west side of the church is the main architectural feature of the building.

The portal, located between the two central buttresses, is framed by two columns with Ionic capitals and is connected to the roadway by a five-sided stoop.

[4] The cul-de-lampes (a type of corbel in "church lamp"-style) (fr) supporting the evangelists are decorated with foliage.

[16] The walls are covered with wood panelling from the Chartreuse de Val-Dieu dating back to the 18th century.

[20] The altar box, in painted wood, ronde-bosse-style (in the round, free standing), is decorated with a Paschal lamb and two bas-reliefs.

[19] The altarpiece is set back under a wide cornice and canopy supported by six black marble columns topped with Corinthian capitals.

[22] The conseil de fabrique (parish church administration) paid the painter 165 livres for his work.

[26] On the outside wall, a marble funerary monument is adorned with an inscription in memory of the mother of the founder of Bon Marché.

It contains a classical-style altar built in the early 19th century and adorned with an altarpiece depicting the Entombment, painted in 1699.

[16] The stained glass window, created between 1920 and 1925 by Louis Barillet and Jacques Le Chevallier, depicts the apparition of Saint Michael to Joan of Arc and commemorates the dead from World War I.

It features a painting of the Adoration of the Shepherds, by Nicolas Mignard, on a classical polychrome stone altar.

[29] It is the tomb of Louis Petitgars, Seigneur de la Bergerie, who died in 1669 after founding the chapel in 1662.

It contains a painting of the four Evangelists by Nicolas-René Jollain, created in 1780 for the Val-Dieu Charterhouse, placed in the Alençon library in 1792, and then deposited in the church of Saint-Sauveur.

[23] Like many Normandy churches, it is composed of painted paneling covering an inverted hull frame made up of four sections at different angles.