 The first parish priest was named Robert and was alive in 1165.There is no record of a parish of Saint-Maclou until 1213, and it was possessed of a double cure until 1736, a peculiarity that could be explained by an older chapel of Saint-Eustache having coexisted for a time with the church of Saint-Maclou, or else by the division of a seigneurial inheritance comprising altar revenues.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.