« Aître » from the Latin “atrium”, designated a cemetery in the Middle Ages. The aître of Brisgaret is a rare example in France of medieval cemetery which kept its original vocation. Its origin goes back to the 15th century, when the main cemetery of Montivilliers is moved on the heights of the city.

The main gallery was built at the beginning of the 16th century and used as an ossuary. The mass grave was regularly returned and recovered bones placed in the ossuary located under the roof of the gallery. Unlike the aitre St Maclou of Rouen built at the same time, the closter of the aitre of Brisgaret has never been completed.