The bell tower is said to be the oldest part of the church of Saint Symphorien and dates from the 12th century. It is pierced by a "triplet", a set of three bays with semi-circular arches. The interior of the church was probably painted in the 19th century.
The nave underwent extensive repairs in the 18th and 19th centuries after the church became a "Temple of Reason" during the Revolution. Having suffered many damages and then the building having been abandoned, in 1802 and until the middle of the 19th century, repairs were carried out. In the 1980s, new restorations were carried out.
Saint Helena was the mother of Emperor Constantine, the first Roman emperor to convert to Christianity in the 4th century. She gave her name to the town, but the church was placed under the patronage of Saint Symphorien. In the 2nd or 3rd century, he expressed his faith in God in public, which was considered a crime. He was put in a dungeon, but remained faithful to his faith and was then beheaded.