Ancient wall discovered beneath Paris may reveal original settlement location

French authorities announced on September 23, 2026, that workers had found an ancient wall beneath a Paris hospital. The wall was discovered during building work at the Hôtel-Dieu hospital on the Île de la Cité, close to Notre-Dame Cathedral.

The stone-and-wood structure is about 20 metres long. Scientists have dated burnt material in the wall to between 10 and 200 B.C. Experts believe it was part of a defensive barrier built by the Parisii, a Gallic tribe who lived in the area during the Iron Age. A Gallic spearhead was also found nearby.

The fire damage may match Julius Caesar's written account of Gauls burning their own town before a battle in 52 B.C. The find could settle a long debate about where ancient Lutetia, the original name for Paris, was actually located.