Église Saint-Philbert de Beauvoir-sur-Mer, Religious monument in Beauvoir-sur-Mer, France

Église Saint-Philbert de Beauvoir-sur-Mer has a triple nave about 49 metres long and 24 wide, with a Romanesque nave, a 13th-century north side aisle and a 19th-century south nave. Its main entrance is the north Gothic porch: four undecorated archivolts over plain columns, a niche above holding a statue of Saint Philibert, and two weathered grey wooden doors.

Saint Philibert's monks from Noirmoutier took refuge here in June 836, carrying the saint's sarcophagus to the villa of Ampan, where it rested two days. The church was rebuilt in 1040 by monks of Saint-Philibert de Tournus; the 11th-century nave was completed in the 12th century by a choir, transept and two apsidioles. In the 13th century a north aisle and the pointed-arch porch were added, and dendrochronology dates the Notre-Dame chapel roof frame to 1280.

The church keeps the name of Saint Philibert, whose monks from Noirmoutier took refuge here with his relics on 7 June 836, staying two days at the villa of Ampan. A stained-glass window at the entrance to the nave marks the eleventh centenary of that stay, and a statue of the saint by Arthur Guéniot stands 150 metres from the church. Another window commemorates Saint Goustan, whose hagiography places his mission and death at Beauvoir-sur-Mer in 1040.

The church sits about 7 meters above sea level and rises prominently above the flat marshlands surrounding Beauvoir-sur-Mer, making it easy to spot from a distance. The surrounding terrain is wet and marshy, so visitors should expect potentially slippery ground conditions when approaching the entrance.

Excavations before the restoration of the Notre-Dame chapel also uncovered graves from the cemetery that once surrounded the church, alongside traces of a building dated to the early Roman Empire. The site's occupation is thus older than the medieval church, but the Roman remains are those of a single structure, not evidence of millennia of habitation.