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Archaeologists working in the courtyard of Paris’s Hôtel-Dieu, on the Île-de-la-Cité near Notre‑Dame, say they have uncovered structural remains consistent with a Celtic fort described by Julius Caesar in 52 B.C. The team reports charred timbers, burnt seeds and a stone-and-wood defensive wall that together support accounts that the settlement was deliberately burned during the Roman campaign.
What the excavation revealed
Excavations that began in February 2026 exposed a roughly 65‑foot (20‑meter) section of a stone-and-timber fortification typical of pre‑Roman Gallic oppida. Archaeologists found a burnt facing on the wall, the remains of a scorched wooden building nearby, and charred botanical remains that point to a large, destructive fire.
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At the base of the wall workers also recovered a Gallic spearhead and other artifacts associated with the late Iron Age. Those finds, together with the construction style, led officials to identify the structure as belonging to the local Celtic community.
Dating the site
Preliminary carbon‑14 dates from wooden elements place the remains broadly between 200 and 10 B.C., a range that covers the period of Caesar’s campaigns in Gaul. Archaeologists described the material as fragile because of the fire damage, meaning the original structures cannot be conserved in situ.
To preserve and share the discovery, teams plan to create a detailed replica using 3D photogrammetry so the wall and its context can be studied and displayed without further disturbing the fragile remains.
How the find matches ancient accounts
In his commentaries on the Gallic Wars, Julius Caesar recorded fighting at Lutetia in 52 B.C. — a settlement inhabited by the Parisii on the Seine island that later became Paris. Caesar describes resistance by the Gauls and notes that they set fire to the town and cut the bridges to keep it out of Roman hands.
The newly uncovered burnt layers and the defensive architecture align with that narrative. Because the Gauls reportedly destroyed their own settlement, physical traces of the oppidum have eluded archaeologists until now.
Scholars react
Officials from the Île‑de‑France Regional Archaeology Service said the wall’s large blocks and interlocking beam system were immediately recognizable as following Gallic construction traditions. They view the discovery as a rare instance where archaeological evidence backs long-standing historical descriptions.
Regional curator Stéphane Deschamps said the find helps resolve a long debate about Lutetia’s precise location. He added that, together with the wall and its artifacts, researchers may now have a clearer picture of the island’s ancient fortifications.
