Source: Centre d’archives de Vaudreuil-Soulanges, M-18 A1, 3.32
The church boasts a seigneurial chapel, situated in the right transept of the building. It is dedicated to the family Chartier de Lobtinière-Harwood. Since the construction of the church, the members of the seigneurial family and their descendants have been buried in the church crypt under the chapel. Commemorative plaques placed on the chapel walls remind us of their presence. The last burial of a descendent in the crypt took place in 2013.