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Church attested in the 12th century. Nave flanked by a north aisle, built between 1540 and 1549 (date of consecration by the bishop of Rennes), and by a south aisle, built between 1603 and 1605 (dates inscribed). Inscription on the south door: ESTANT NOBLE ET DISCRET PRESTRE : RENE DE L'ESPINAY RECTEUR DE PIRE : SIEUR DE LA GUAYE FUT CESTE EDIF : CE COMMENCE. SA (NC) TE DEUS SA (NC) TE FORTIS SA (NC) TE IMORTALIS MISERERE NOBIS SA (NC) TE PETRE ORA P (RO) NOBIS : TOUT EST A Dieu 1603. The choir was first rebuilt in 1627, then surmounted by a dome struck by lightning in 1741, then again between 1752 and 1775, flanked by side sacristies. Bell tower at the top of the nave rebuilt in 1669. In 1874, architect Aristide Tourneux had a bay added to the north of the nave and a porch-tower surmounted by a spire built. Stained glass windows signed and dated: Claudius Lavergne 1882, and also stained glass windows from the Rault workshops and the Carmel of Le Mans. South wall of the enclosure redone in the 19th century with a monumental corner staircase.

Church built in the 15th century, from that period only the choir and the chapel to the north, which became the sacristy, currently remain. The nave and transept were rebuilt in 1851 (inscription: MR. RUPIN MAIRE ET LES PAROISSIENS 1851). The tower is dated 1859, it was built by Guyon, an entrepreneur from Vitré.

New church built from 1861 by Audrouin a hundred meters south of the old one. It was completed in 1875 with the construction of the tower.

The bell tower is visible from afar and has long dominated the town and its surroundings. The Saint-Pierre church has retained its impact on the local landscape for over a century. It was indeed in 1888 that the Fabrique Council decided to entrust Arthur Régnault, the diocese's architect, with the project for a new construction. His plan was accepted and work began in October 1889, before the blessing of the first stone on March 13, 1890. As an anecdote, the stones are extracted from the quarry of La Bouëxière. Quickly, the inhabitants discovered its citadel-like appearance, Arthur Régnault having wanted to honor the city of Châteaubourg which had not had a castle for a long time! The structural work was completed on March 28, 1893, but due to lack of funds, the bells would wait until 1894. The work on the woodwork and the construction of the high altar took place in 1911, the church being due to host the important Eucharistic congress of 1913. Maintenance work continued over the years, the church having become the property of the municipality since 1905. During the bombings of the summer of 1944, the church was spared. The inhabitants would not forget it: on May 9, 1945, the day after the armistice, the men carried Notre Dame de Boulogne in procession and paraded barefoot through the streets. The centenary was celebrated in 1992 with the decision to install the current organ. The church of Châteaubourg has thus traversed local history from the 15th century – the date of construction of the previous, much smaller church – to that designed by Arthur Régnault.

The sacristy and tower of the current church were built in 1628 and 1632. A chapel was dedicated to Saint Nicholas in 1643. As for the nave, it dates from 1856. It contains a carved wooden altarpiece, bearing the coat of arms of Brignon, one of the church's financiers.

It originally consisted of a simple nave built in the 15th and 16th centuries, and whose straight chancel was rebuilt in 1700. The church, thus restored, was solemnly blessed by the rector on August 2, 1761. In 1806, a chapel dedicated to Saint Margaret was added to the south, and in 1818, to the north, the tower was partly redone, with at its base the chapel of the Virgin Mary. The lord Du Val, at Saint-Didier, has in the church of Saint-Jean-Baptiste a tomb where Jean de La Porte, lord Du Val, was buried in 1618, and in 1761 Suzanne Marion, daughter of lord Du Val and widow of Charles Du Boispéan. M. de Guersans, vicar general, erected the confraternity of the Holy Spirit at Saint-Jean-sur-Vilaine on June 25, 1746. Several foundations exist in this church: that of Le Poirier, that of La Bâte, that of La Porte. Jeanne Guyot, lady of La Hamonais, founded an annuity of 36 livres for the maintenance of candles during the octave of the Blessed Sacrament.

This parish belonged to the Collegiate Church Notre Dame de VITRE until the year 1116. It was then handed over to the Abbey of Saint Melaine (in RENNES). SAINT-DIDIER, the patron saint of the Parish, is undoubtedly the holy bishop of RENNES who lived at the end of the 7th century. His statue is part of the altarpiece of the high altar (1721), as well as that of Saint GOLVEN.

The church of Saint-Sulpice (17th century). Dedicated to Saint Sulpice, bishop of Bourges, the church of Ossé consists of a single nave ending in a straight chancel, to which two chapels have been added, forming the transepts. It has no style and may partly date back to the 16th century, as indicated by the ogival window of its chancel, now walled up. The North chapel, dedicated to the Virgin Mary, and originally reserved for the lord of Charot, was built in 1611. The other chapel, dedicated to Saint Nicholas, also seems to be from the 17th century. Le Plessix d'Ossé was the manor house of the parish. In 1440, Duke Jean V settled a dispute concerning the right of burial in the church of Ossé between the sieur du Pan, lord of Plessix, and the sieur de Montbeille, lord of Grées. The ecclesiastical superiority belonged to Ossé to the baron de Châteaugiron, but the lord of Plessix enjoyed the rights of founder and patron; this was declared in 1694 by Gabrielle Glé, marquise de la Vallière and lady of Plessix (National Archives, P. 1721). Jacques Le Prestre, baron de Châteaugiron, having acquired Plessix in 1744, took possession of all these honorary rights and had his coat of arms placed in the choir and on the high altar of the church of Ossé. As for the lord of Charot, he had his tomb, his pew, and his coat of arms in his reserved chapel. The bell tower dates from 1899. The altarpiece of the Holy Trinity dates from the 17th century.