The church of Saint-Rieul at Verrines, a hamlet in the commune of Néry (Oise), now closed to worship, is unprotected by law and has been the object of very little study. In 2018, however, the town council initiated a restoration programme, on which occasion the architect requested archaeological advice. Our intervention took different forms: the monitoring of works on the elevations, four exploratory trenches, and a succinct analysis of building archaeology. We were thus able to collate the earlier historical and architectural records and to gain a more detailed knowledge of the building, defining at least seven stages (leaving aside the question of decoration and furnishings) between the middle mediaeval period and the French Revolution. The four most interesting points are the unusual evolution of the South transept, apparently twice destroyed, the extremely meticulous execution of the building works in general on what was originally a mere chapel, the presence of an unfinished belfry stack in the roof space, and the hypothesis that the church was entirely rebuilt around the beginning of the 16th century, making use of the foundations (and thus the ground plan) of the mid- mediaeval period. A fine example of an archaeologically surprising rural church, which probably bears comparison with the church of Saint-Rieul at Louvres (Val-d’Oise). Traduction : Margaret & Jean-Louis CADOUX