The second possibility is more plausible because the chapel was founded in 1110 and was only served by vicars of the parish of Saint-Mellon, and was perhaps only a side chapel of an earlier church of Saint-Maclou known since 1090.
The second possibility is more likely because the chapel was founded in 1110 and was only served by vicars from the parish of Saint-Mellon, and it may have been a smaller chapel of an earlier church of Saint-Maclou that existed since 1090.