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Placed under the patronage of Saint Hilaire, this parish was given by Gannelon de Montigny, lord of the place, to the abbey of Marmoutier around 1042. Its reconstruction probably dates from this period; it then became a priory. The church has a rectangular nave ending in a choir with a flat chevet. An examination of the masonry easily reveals two distinct periods of construction: the Romanesque period and the Renaissance. Built of flint rubble with rendering, the western part of the building appears to date from the 11th or 12th century. A limestone cornice supported by rather crude corbels underlines the base of the roof. To the south, two narrow Romanesque windows flared inwards light the nave. To the north, the bays were later reworked and enlarged. On this same side, a Romanesque doorway was walled up; It allowed the church to connect with a building whose traces of detachment remain. The bell tower was built to the north of the Romanesque nave, extending the western façade. The absence of a connection between the east and west walls of the bell tower and the north wall of the nave clearly indicates that it is an entirely later construction. However, its crowning is much later, as evidenced by its cornice, whose molding is in the classical style. Flanked by obliquely angled buttresses, it is covered with a saddleback roof. The eastern half of the church appears to be an extension built during the Renaissance period. Its ogee-shaped cornice and the decoration of the eastern gable, as well as the moldings of the buttress bands, attest to this dating. A vast rectangular choir then appears to have replaced a semicircular Romanesque apse; the eastern gable and the southern and northern façades were then pierced with networked bays. In the lower part of the north façade, projecting ashlars appear to have supported the roof of a lean-to building. To the south, a sacristy was built in the 19th century. Inside, the entire building is covered with a paneled vault with exposed tie beams and kingposts. The 18th-century high altar is surmounted by an Assumption of the Virgin inspired by Murillo's. For the restoration of the roofs and façades, the Sauvegarde de l'Art Français (French National Art Protection Agency) awarded a grant of €30,490 in 2001.

The Church of Saint Sauveur La Trinité, probably built in the 12th century, is notable for its Romanesque windows with columns and capitals. On its walls, alternating with the consecration crosses, one can admire a Stations of the Cross in blue enamel on earthenware. The choir is lit by five Romanesque windows decorated with stained glass depicting Our Lord and the four Evangelists.

The church consists of a single nave, extended by a single-bay choir, and a semicircular apse. Two canted chapels, forming a false transept, were added during this renovation. The church is dominated by a timber-framed bell tower that rises above the first bay of the nave. The gable of the western facade was rebuilt in the last century, an external wooden porch removed. The central axis of the current facade is punctuated by a semicircular door surmounted by an archivolt, a circular opening on the first level and a small window pierced in the upper part of the gable. On the north side, a highly raised stringcourse forming a cornice, resting on simple modillions, still survives in the upper part of the wall. Additional openings were added to the old, narrow, and uneven openings in the last century, in the nave, as well as in the choir and apse, to allow more daylight to enter the building. The interior of the church is covered with a paneled roof structure: the one covering the nave is believed to date from the 16th century. The entire structure has been given a coherent decoration, from the faux-stone plasterwork to the paneled vault, the furnishings, and the statuary. The church also boasts a 17th-century polychrome wooden statue of Saint Barbara. The Prunelé coat of arms appears at the bottom of the stained-glass window of Saint Louis and, outside, on a medallion on the apse wall. The Sauvegarde de l'Art Français (French National Art Protection Agency) granted €5,000 in grants in 2004 for masonry and roof repairs and the installation of drainage.

Before the 13th century there were two parishes, Saint-Sauveur and Saint-Gilles, in 1300 the bishop of Chartres united them into one by a charter of Berchères, because of the smallness of the two parishes. The church dates from the beginning of the 17th century. Rebuilt on the foundations of an old Romanesque church, its originality comes from its bell tower with saddle roof, its caquetoire and its paneled vault redone in 2003. At the initiative of the Prince Duke of Montmorency-Laval, it has contained the reliquary of Sainte-Félicité since 1838. Saint Félicité, whose relics are in Montigny-le-Gannelon, is a martyr whose life is unknown, whose body was taken from the sacred cemeteries of Rome. We have his body, the skull, the bones of his arms, fingers and feet. They were removed from the Saint-Cyriaque cemetery in 1828 and placed in their respective places on a body artistically modeled in wax and measuring more than 1.40 meters in length. A magnificent chase, of the shape and size of an altar tomb, all furnished with glazing and embellished with gilding received this precious deposit. Pope Leo XII donated it to the Duke of Laval, then Charles X's ambassador to Rome. On his death, he bequeathed it by will to the church of Montigny-le-Gannelon where the old historic castle of Laval-Montmorency is located. The venerated hunt is now placed under the main altar of which it forms the tomb.

The church has a very pretty Renaissance-style choir entrance. Certain stained glass windows, the woodwork of the choir, the altarpieces and the font are classified. The current church, rectangular in plan, replaced a 12th century building. The flat bedside and the north wall, equipped with Romanesque windows and slightly projecting buttresses, date from this period. It was rebuilt and probably enlarged in the first half of the 16th century. It was then covered with beautiful paneling, the beams of which bear the arms of the Vove, lords of Saint-Agil. The church is also flanked to the south by a seignorial chapel of two bays opening onto the nave with two molded semi-circular arches: its ribbed vaults, with eight ribs leading to the four peaks of a central diamond, are each decorated with four sculpted pendant keys, one of which also bears the arms of the Vove; the date 1547 can be read on its door. The church is currently preceded by a bell tower built in 1886 by Mr. Travaillard, an architect in Saint-Calais. A window to the south of the choir has preserved a partly restored 16th century stained glass window, representing Saint-Agil and Saint-Fiacre, and one of the windows of the seigneurial chapel has another, representing the Nativity, the Adoration of the Shepherds and the Adoration of the Magi; the other window of this chapel has a modern stained glass window retaining some old fragments in the speckles. The choir was decorated with woodwork including an entrance arcade surmounted by a crucifix, stalls, a communion table and an altarpiece, the latter dated 1734. We can also point out a font decorated with balusters and of a skull (1552), the poetic epitaph of Catherine-Geneviève de Verthamont (1740), a painting representing a martyr (17th century), a Louis XV console and a Venetian glass chandelier.”

It was Saint Thuribe in the 5th century who dedicated the oratory that preceded the current church to Saint Pierr. Tradition reports that Saint Thuribe, Bishop of Le Mans, ordained on September 30, 490, came to preach Christianity in the region of Saint-Calais where he dedicated other oratories to Saint Peter. In Berofacium (Berfay), he would have "gone down" to a certain Gaïanus, holder of property or exercising military command. The roussard stone buttresses and the walled semi-circular bay bear witness to 11th or 12th century architecture. The Saint Pierre church was originally supposed to consist of a simple nave extended by a straight apse. Like many churches in the surrounding area, it was redeveloped in the 16th century (addition of the north side aisle) and restored around 1876, with the addition of the south side aisle. The work was carried out thanks to a bequest from Mrs. Mercent to the factory, an organization responsible at the time for managing the church's property. The exterior walls were re-coated in 1924.

The Saint Jean Baptiste Church was built in the 16th century and transformed in the 19th century.

This church in Romilly-sur-Aigre was dedicated to Saint Peter (Saint Pierre). Simon, nicknamed Peter (Rock), was a fisherman on the Sea of Galilee when he - together with his brother Andrew - was called by Jesus Christ to be "fishers of men". According to Catholic understanding, he is the supreme apostle, and the two millennia-long line of popes - currently Francis - are his successor. On statues and paintings, Peter is almost always depicted with two keys in his hand; this attribute refers to the biblical saying in Matthew: “I will give you the keys of the kingdom of heaven; Whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven” (Chapter 16, verse 19). Peter and Paul are also known as the “Princes of the Apostles”; their common feast day in the saints' calendar is June 29th.