Archaeological excavation beneath Notre Dame uncovers Roman coins and unexplained medieval markings

Researchers digging beneath the iconic Notre Dame cathedral in Paris have brought to light centuries of hidden history, including a 1,700-year-old Roman coin and mysterious inscriptions that continue to puzzle experts. The excavation, launched following the reconstruction of the cathedral after the catastrophic 2019 fire, has revealed layers of the city’s past buried approximately 13 feet below the forecourt. Among the remarkable discoveries are artifacts from the 4th century and medieval pottery fragments bearing markings that archaeologists have yet to decode.

The project has been described by French media as a once-in-a-lifetime archaeological opportunity. Teams have uncovered hundreds of objects that offer glimpses into daily life across multiple eras, from Roman occupation through the medieval period. The findings include not only small artifacts but also structural remains that reveal how the area evolved over millennia.

Roman currency and medieval pottery reveal ancient secrets

One of the most significant finds is a 4th-century coin bearing the image of Emperor Constantine, a tangible connection to Roman Paris. The coin provides evidence of the economic activity and imperial presence in the region during Late Antiquity. However, the most intriguing discoveries are the medieval pottery fragments adorned with reddish markings painted on their interior surfaces.

Archaeologist Valentine Breloux emphasized the rarity of finding intact ceramic pieces at such sites. The mysterious painted symbols inside the pottery fragments have become a focal point of research, as specialists work to determine their purpose and meaning. Whether these markings represent ownership marks, religious symbols, or utilitarian notations remains unknown, adding an element of mystery to the excavation.

Medieval waste pits yield hundreds of preserved artifacts

The excavation has also revealed a medieval latrine that doubled as a garbage disposal area, containing remarkably preserved everyday items. Among the objects recovered from this ancient waste pit are:

• Complete ceramic jugs and drinking cups
• Broken plates and serving vessels
• Animal bones from consumed meals
• Various household refuse from medieval inhabitants

These waste deposits offer valuable insights into the diet, craftsmanship, and daily routines of medieval Parisians. The anaerobic conditions within the latrine helped preserve organic materials that would typically decompose, providing researchers with unusually complete samples.

Ancient grain storage and repurposed Roman materials discovered

The dig has uncovered medieval grain pits dating from the sixth to the tenth centuries, which were used to preserve harvested crops. These underground storage facilities demonstrate the agricultural practices and food preservation techniques employed during the early medieval period. The pits’ locations suggest the area served agricultural functions long before becoming part of the cathedral grounds.

Researchers also found a Roman-era doorstep that had been removed from its original structure, flipped upside down, and repurposed as road paving. This discovery illustrates the practical approach medieval builders took toward reusing materials from earlier Roman constructions, a common practice when stone and worked materials were valuable commodities.

Search continues for evidence of Gauls and earlier settlements

While the Roman artifacts represent some of the most prized discoveries, the archaeological team harbors hopes of finding evidence of the Gauls, who inhabited the region before Roman conquest. Archaeology student Yasmine Benali described the visible stratification at the site, noting layers representing medieval Paris, Roman Paris, and potentially even earlier periods. The excavation provides a rare vertical cross-section through the city’s accumulated history.

Lucie Altenburg, a conservator with the Paris archaeology unit, characterized the project as an exceptional opportunity to push back the chronological boundaries of understanding Parisian history. The work allows researchers to contribute tangible evidence that will reshape historical narratives about the city’s development and the populations that inhabited the area across millennia.

Public engagement and future cathedral square renovation

The excavation is connected to a broader renovation of the Notre Dame square, scheduled for completion by 2028, which will incorporate trees and visitor-friendly amenities. The archaeological work must be completed before construction can proceed, creating pressure to thoroughly document findings while maintaining the project timeline.

Visitors and tourists have expressed fascination with the ongoing work. Emily Carter, a tourist from Manchester, noted that the excavation transforms the Notre Dame experience, making visitors aware of the hidden city beneath their feet. The work has effectively brought new life to the site during the cathedral’s reconstruction period, offering an unexpected dimension to the historic landmark.

The team continues methodical excavation and analysis, with each artifact carefully cataloged and preserved. The findings will ultimately contribute to museum collections and scholarly research, ensuring that this brief window into Paris’s buried past yields lasting educational value for future generations.