Ancient Wall Beneath Paris Hospital May Pinpoint the City's Origins

A 72-foot stone-and-wood wall discovered beneath the Hôtel Dieu hospital on the Île de la Cité may settle one of French archaeology's longest-running debates: where Paris began.

Construction crews struck the wall this summer, according to the New York Times. Archaeologists working at the site also recovered a Gallic spearhead nearby. Carbon dating places the structure between 200 BCE and 10 BCE — the decades surrounding Rome's conquest of Gaul.

The location matters. In his account of the Gallic Wars, Julius Caesar described Lutetia, a fortified settlement built by the Parisii, the Gallic tribe that ultimately gave Paris its name. Caesar placed Lutetia on an island in the Seine and recorded that its inhabitants burned the settlement and destroyed its bridges as Roman troops advanced. Rome took the town regardless, in 52 BCE.

For decades, archaeologists doubted Caesar's geography. Physical evidence of a major Gallic settlement on the Île de la Cité was thin, while excavations in Nanterre, west of Paris, kept producing finds. By the 1990s, some scholars had concluded that ancient Lutetia actually stood in Nanterre, not at the heart of modern Paris.

The new wall changes that calculus. Matthieu Poux, an archaeology professor at the University of Lyon II and formerly among the skeptics, told the Times the find changed his mind. He now has "no doubt" that the ancient city sat on the Île de la Cité.

One detail stands out: the wall was burned. Archaeologists found charred seeds and the remains of a burned wooden building nearby. Those traces at least raise the possibility that researchers have uncovered physical evidence of the destruction Caesar described more than 2,000 years ago. The claim remains premature. France's culture ministry says further work is needed to establish exactly when the wall was built and what purpose it served.

Even short of that identification, the discovery fills a substantial gap in the history of one of the world's most excavated cities. Archaeologists know Roman Paris well — settlements survive beneath today's Latin Quarter and Luxembourg Gardens — but Gallic Paris has proven far harder to pin down. Poux said this single excavation has increased the available evidence on the subject "tenfold."

Further excavations are planned around the hospital. The wall itself will eventually be removed for study and put on display, giving the public a direct look at what may be the oldest built structure of Paris yet identified.