The ancient thermal baths of Faverges-Seythenex, located at the place called Le Thovey, are part of a Gallo-Roman mansio (inn-relais) linked to the Vicus of Casuaria (present Viuz). The site, located 1 km southeast of this ancient village, operates a natural spring and extends over 9,000 m2. It develops into two phases: a first occupation from the second half of the first century (around 50 AD for the thermal baths), followed by a reconstruction after a fire around 120, with a peristyle added around 200. The buildings, organised around a central courtyard, combine thermal spaces and houses.
Remnants were reported from the 19th century by local scholars such as Charles Marteaux and Marc Le Roux (Académie florimontane), who mentioned archaeological traces near the Chemin du Tové in 1903. The first systematic excavations began in 1973-74, followed by major campaigns in 1981 and 1999. The site is listed as a historic monument on December 22, 1992. It illustrates the importance of Roman roads in the Alps, such as the Itinerary of Antonin, which cites the Casuaria mansio as a stage between Boutae (Annecy) and Italy.
The spa complex, owned by the municipality, includes heated rooms (caldarium), basins, and living spaces organized around a peristyle. Its abandonment occurred in the first half of the third century, probably linked to the decline of Roman infrastructure in Gaul. The excavations revealed typical architectural elements (hypocausts, mosaics) and everyday objects, providing a light on life in this border area between Lake Annecy and Alpine valleys.
Today, the site is referenced in the Mérimée and Digital Atlas of the Roman Empire bases. Although its exact location (484 Route d'Albertville) is documented, its accessibility to the public remains limited. Recent studies, such as those of Alain Piccamiglio (2005), highlight his role in the local old and religious network, associated with a nearby sanctuary.
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