Wall offers window into origins of Paris

By the Editorial Team · Friday, September 25, 2026

Archaeologists uncovered a 22-meter-long Gallic wall dating to the late Iron Age during construction at Hôtel Dieu hospital on Paris’s Île de la Cité, supporting the island as the original site of ancient Lutetia. This finding challenges previous theories placing Lutetia elsewhere and provides new evidence aligned with Julius Caesar’s accounts, prompting further excavations and preservation efforts.

An archaeological discovery made this summer during construction work at the Hôtel Dieu hospital on the Île de la Cité in central Paris is providing new insights into the origins of the ancient city of Lutetia. Experts say the unearthed wall, composed of stone and wood and measuring approximately 22 meters (72 feet) long, aligns with typical Gallic fortifications from the late Iron Age, a period ending near the first century B.C. This finding could shed light on the early settlement patterns around the time Julius Caesar described the Roman conquest of Gaul.

The site, located on an island in the Seine River, is significant because Lutetia—an early settlement attributed to the Parisii tribe—is believed to have been established in this area as early as the fourth century B.C. Caesar’s account in his Commentaries on the Gallic Wars mentions Lutetia as an island town with fortifications, which the Gauls reportedly set ablaze and dismantled its bridges prior to the Roman takeover in 52 B.C. Despite this historical narrative, the precise location of the original Gallic city had been a matter of debate among archaeologists and historians.

Some scholars previously suggested that Lutetia might have been situated in Nanterre, a suburb west of Paris, based on discoveries made there in the 1990s. However, Matthieu Poux, an archaeology professor at the University of Lyon II who once supported this view, stated that the recent discovery has changed his position, now affirming the Île de la Cité as the ancient city’s location.

Initial carbon dating of wood fragments from the site places the wall’s construction between 200 B.C. and 10 B.C., a timeframe consistent with the late Iron Age and the period of Caesar’s campaign. The wall also bears evidence of burning, including charred seeds and the remains of a burnt wooden structure, which may corroborate Caesar’s description of the Gauls setting fire to their settlement before Roman forces arrived.

While previous archaeological work uncovered Roman-era artifacts beneath the Latin Quarter and the Luxembourg Gardens, the newly found wall adds substantial data about the Gallic phase of Lutetia, a historically understudied period. Poux described the discovery as a major development that increases knowledge of early Paris by “tenfold” from a single excavation campaign.

The French culture ministry, led by Catherine Pégard, has acknowledged the importance of the find while noting that further research is necessary to confirm the wall’s precise function and chronology. Plans are underway for additional digs near the site, with goals to preserve the entire structure for study and public display. Paris Mayor Emmanuel Grégoire emphasized the city’s commitment to sharing this heritage with residents and visitors, highlighting its significance in the history of Paris.

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