Basilica of Saint-Denys, Argenteuil

The community at Argenteuil that first received the Holy Tunic was a royal Benedictine convent, associated in tradition with a daughter of Charlemagne as abbess, and the gift of the tunic around the year 800 is presented by the church as arriving through the emperor's channel to the Holy Land relics that Byzantine diplomacy and pilgrimage had made available to Western rulers in that period. The convent's own institutional history did not survive intact into the modern era: like many French religious houses, it was suppressed and its buildings largely destroyed during the French Revolution, and the tunic itself was hidden by local parishioners rather than displayed through that period, reportedly buried in a garden to protect it from revolutionary seizure and desecration.

The present Basilica of Saint-Denys is substantially a nineteenth century building, reflecting the loss of the medieval convent structures rather than continuous occupation of the original site, and its status as keeper of the tunic today rests on parish and diocesan custody rather than on any surviving monastic community. This makes Argenteuil's relic history unusually discontinuous even by the standards of medieval relics, since the object survived a period when the institution meant to guard it effectively ceased to exist.

Argenteuil's Holy Tunic is not the only garment in France venerated as the seamless robe mentioned in the Gospel of John, over which soldiers cast lots at the crucifixion rather than dividing it; a second tunic with its own tradition is kept at the Cathedral of Trier in Germany, and the existence of two objects claiming the same singular garment has been a recognised difficulty for centuries rather than a modern discovery. Argenteuil's church addresses this by treating the traditions as referring to different garments, plausibly explained by the layered clothing described in some Gospel accounts, rather than by asserting Trier's relic is false, a diplomatically cautious position common to competing relic claims within a single tradition.

Scientific examination of the Argenteuil cloth has included textile and pollen analysis intended to establish its age and geographic origin, work whose interpretation remains debated among specialists rather than settled; the church has permitted researchers access at various points while maintaining that the tunic's significance for the faithful rests on continuous veneration and transmitted tradition rather than on the outcome of laboratory dating. As with comparable relics elsewhere in the atlas, the object is best understood as materially undated with confidence and historically attested only from the point at which documentary record begins.