However, it is best known for its fittings and stained glass windows commissioned by the Abbé Gillard between 1942 and 1962 which mix pagan themes from Arthurian legend with Christian elements.

The creation of a priory dependent on the Abbey of Notre Dame de Paimpont [fr] (later also a parish church) dates back to 1191.

Similarly, the first mayor, elected on 26 December 1791, had the parish calvary demolished and the church bells sent to the foundry to make cannons, as the government demanded.

These, which can still be seen today, include two wooden statues of Saints Onenne and Judicaël by the sculptor Edmond Delphaut, a series of stained-glass windows by Henry Uzureau illustrating the life of St Onenne,[13] a series of paintings, altarpieces and other fittings by Karl Rezabeck and Peter Wisdorff (both released German prisoners-of-war),[14] and a mosaic of the white hart of Brocéliande, symbolizing Christ, by Jean Delpech.

The Grail appears in the east window with Joseph of Arimathea and Christ, and it manifests itself to King Arthur and his knights in a painting above the sacristy door.

[15] Morgan le Fay figures in one of a series of paintings on the Stations of the Cross, notable for setting the story in local Breton scenes.