As early as the 6th century, the city of Mouzon had several churches attached to the diocese of Reims: Saint-Martin within the city walls and Saint-Pierre and Sainte-Geneviève extra muros.. In the 9th century, a church of Notre Dame was founded within the first monastic establishment, bringing together
Benedictine nuns. In 971, Adalberon, Archbishop of Rheims, dissatisfied with this community of canons living in a particular disorder, re-established a monastery with the help of Benedictine monks coming from
Thin-le-Moutier, who also replaced the church of Notre Dame, the
chapter of canons. This reform was carried out rapidly. The relics of Saint Arnoul, a pilgrim murdered in the 8th century, were entrusted to this new community, adding to those of Saint Victor. These saints were lay people who could respond to a famous aspiration to holiness. With the influx of pilgrims coming to venerate the relics, the abbatial church became too small. At the same time, there was a general trend towards enlarging church
choirs to provide a more spacious setting for a liturgy called for greater pomp. This movement affected abbatial churchessuch as
Saint-Rémi in Reims,
Vézelay and
Saint-Germain des Prés. The project to build a new choir and the entire eastern part of the church was launched in the early 1190s, taking into account innovative architectural approaches implemented as early as 1130 by
Suger for the abbatial
church of Saint-Denis. In addition to this project, another ambition led to the expansion of the clergy area in the existing church: in the same years, Archbishop
Guillaume aux Blanches Mains of Rheims was planning to divide the
diocese of Rheims by creating a bishopric in Mouzon. Mouzon was the second-largest city in the diocese, ahead of
Mézières,
Rethel,
Attigny,
Rumigny,
Épernay, etc., The project for a new diocese, although approved by
Pope Celestine III and later by his successor
Innocent III, was finally abandoned by the archbishop of Rémois a few years later, in the late 1190s, even though this first stage in the transformation of Mouzon abbatial churchchurch had come to fruition. The upper part of the two towers, on the other hand, dates from the 16th century, while maintaining the same style. in addition to the flamboyant galls roof installed above the
tympanum of the western portal in the previous century. The additions in the 17th and 18th centuries focused more on interior fittings and religious furnishings. In 1725, the organ was installed, built by Christophe Moucherel, and initially placed in the north transept. Finally, in April 1728, the
Master Altar was consecrated. In 1789, the
French Revolution made the abbey's property available to the Nation by decree on 2 November. Concerning the real estate, the farms and mills were auctioned off as national property. However, the municipality of Mouzon saved the essentials by reserving the
cloister for the use of the elderly and the sick and changing the use abbatial church. This municipality indeed submitted a request to the
Director du Département asking that the abbatial church become the
parish church, thus sacrificing the old parish church to the demolishers. When the civil constitution of the clergy was decreed in August 1790 and a short-lived diocese of the Ardennes, distinct from the diocese of Reims, was created, the same municipality hoped for a few weeks that Mouzon would be erected as the seat of this new diocese and that the former abbatial church would become the diocesan church, but the State chose Sedan. Lacking maintenance and with cracks in its fabric, the building underwent a major restoration campaign from 1855 to 1890. It was classified as a
historical monument from the
liste de 1840. In 1932, the Commission of Historical Monuments rejected stained glass projects. In retrospect, such an initiative would have proved futile since 1940 shells fell on the abbatial church, shattering the existing windows and stained glass. One shell damaged the rose window illuminating the southern part of the transept, and another tore through the vault, requiring some reparation. The stained glass windows were replaced by white glass or sober stained-glass windows with simple geometrical patterns. == General architecture ==