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Roman Mosaic With Rare Pigments and Surprising Preservation Discovered by Archaeologists on the Southern Hill of France During Preventive Excavations.
The hill of l’Ermitage, in Alès, in southern France, has harbored a secret for over two thousand years. Beneath layers of soil and stones, archaeologists found a nearly perfect Roman mosaic.
The discovery occurred during preventive excavations organized before the start of a new urban project. The beauty, rarity, and preservation of the piece impressed the specialists.
Excavations Reveal Archaeological Treasure
Between February and June 2025, researchers from the National Institute of Preventive Archaeological Research (Inrap) excavated an area of 3,750 m² on the slopes of the hill.
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The work was coordinated by Olivier Mignot and revealed structures that go far beyond common ruins.
At least four domestic units were partially excavated into the rock, a monumental building of 750 m², and successive phases of construction, as well as a sophisticated hydraulic system, were identified.
But the highlight was the Roman mosaic, considered one of the most important finds in the region in recent years.
Luxurious Residence Preserves Rare Work
The building where the mosaic was found appears to have been a domus, a typical urban Roman house for wealthy families. Its walls were built with stones linked by earth, a common style in the Republican period.
Initially, the floor was made of packed earth, but it was replaced by a mortar floor and mosaics in a second phase of occupation.
The main piece discovered is a pavement measuring 4.5 by 3.8 meters, with a geometric design made of small white, black, and some red stones.
This deep and rare red tone may have been made with cinnabar, a valuable mercury-based pigment. The combination of colors and shapes creates an impactful visual effect.
Three white bands surround the central part, which intrigued the archaeologists. They may have delineated alcoves, dining areas, or spaces for furniture.
On one side, the pattern of white crosses on a black background suggests a passage or door to another room.
Conservation Surprises Specialists
The level of preservation of the mosaic is extraordinary. Even remnants of paint are still visible on the stones. This type of vestige is rare and indicates that the piece was protected for a long time beneath the layers of soil.
Philippe Mercoiret, a mosaic specialist from the Museum of Saint-Romain-en-Gal, confirmed that the piece will be removed with great care to be restored.
The city of Alès is already planning to create a dedicated space for the display of this and other archaeological treasures found at the site.
Roman Engineering Reveals Advanced Techniques
The value of the find goes beyond aesthetics. The excavation revealed technical knowledge used at the time. The houses were excavated directly into the limestone rock and coated with clay.
This layer acted as a natural waterproofing, protecting the interior from moisture during rains.
Under the floors, the Romans used a mixture of limestone dust and stone fragments, called brasier, which served as a solid base and allowed water drainage.
Another highlight was the drainage system made with cut amphorae fitted in sequence. This structure led water from the roof outside the building, demonstrating creativity and efficiency.
Traces of Late Antiquity and the Middle Ages
The hill also revealed signs of later occupations. On the southern side, archaeologists found at least ten graves dated between the 5th and 6th centuries.
The bodies were oriented with the head to the west. Despite the loss of wooden coffins over time, some graves retained stone coverings. The simplicity of the tombs suggests they may have belonged to a Christian community.
During the Middle Ages, the site was reused by Augustinian monks. They built a small hermitage between the 11th and 12th centuries. In the 16th to 18th centuries, the hill was transformed into faïsses, a system of agricultural terraces typical of southern France.
Each excavated layer revealed a new phase in the region’s history. From Roman households to medieval religious buildings, through ancient agricultural practices, the land bears signs of multiple occupations throughout the centuries.
Connection with Other Important Finds
This is not the first notable mosaic found on the hill of l’Ermitage. In 2008, archaeologists discovered the largest mosaic in France at the same location, dated from the time of Julius Caesar.
This history reinforces the importance of the city of Alès in antiquity.
Located between Narbonnaise Gaul and the Rhône basin, Alès may have been an important commercial center as early as the 1st century BC. The new find reinforces this hypothesis and expands knowledge about urban life in southern Gaul.
A Gem for the City of Alès
The discovery of the mosaic excites not only scholars. For the residents of Alès, it represents a link to the past. A living reminder that their city was once the stage for sophisticated life, with careful constructions and refined aesthetic taste.
The expectation is that new excavations will reveal even more hidden secrets beneath the soil. Olivier Mignot declared: “It was a surprise, of course. Seeing the quality of the site, I hope that new preventive excavations can be carried out in the future.”
Meanwhile, the restoration process of the mosaic continues with attention and care. The piece is expected to occupy a prominent place among the greatest archaeological finds in France, being regarded as a true masterpiece preserved by time.
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