The is, according to the tradition, the heir of a chapel built here by St. Helena in the 4th century and of an abbey founded by Charlemagne. Better documented is the creation of an Augustinian abbey by Algar, the new bishop of Coutances (formerly the prior of Bodmin Priory, Cornwall) in 1132. The Romanesque church was consecrated in 1202, being largely remade in the following centuries with successive renovations. The choir was remade in the 16th century while the bell tower is from 1860 to 1863. During World War II, the bell tower (located laterally) collapsed and it was on its ruins where the body of Major Howie was placed; a new bell tower was rebuilt in 1957 on the forecourt in a modern style. On the church square stands the departmental monument in memory of the victims of the wars of Algeria and Indochina, opened in 2005.