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# Archaeologists Discover Palace in Burgundy Kept Roman Comforts in Early Medieval Times
- URL: https://romanempiretimes.com/mesmont-possible-palace-roman-heating-burgundy/
- Published: 2026-10-18T12:24:00.000Z
- Updated: 2026-10-18T12:23:59.000Z
- Description: At a hilltop settlement in Burgundy, a possible palatial complex combines a large church, Roman-style heating and fine glass across the transition into the Middle Ages.
- Author: George Liapis
- Tags: Roman Empire News, hypocaust, France, Christianity, Mesmont, Burgundy

Archaeologists investigating a wooded hill at Mesmont in eastern France have uncovered further remains of a possible palatial complex whose occupants maintained Roman building traditions into the early Middle Ages. The latest excavation exposed a substantial stone building beside a church, adding to evidence for an affluent settlement above the Ouche valley, west of Dijon.

Fragments of an underfloor heating system, carefully built masonry and hundreds of pieces of glass help explain why the researchers associate the site with powerful inhabitants. The complex was established during the fifth century and remained occupied until the beginning of the eighth, according to the current assessment of its pottery and radiocarbon dates.

France’s National Institute for Preventive Archaeological Research, Inrap, presented the findings on 12 October, updating its announcement the following day. Its description of a palace concerns the character of the buildings and the resources behind them; the identity of their later patrons remains an open question.

## A hilltop settlement takes shape

The Montagne de Saint-Laurent rises above the surrounding countryside, with steep slopes enclosing a plateau of approximately 13 hectares. A higher central spur forms its most prominent part. The location overlooks the middle Ouche valley and the passage between the drainage basins of the Saône and Seine, giving the site an important position within the local landscape.

Archaeological discoveries have been reported here since the eighteenth century. The hill was frequented in the Neolithic period and occupied more intensively in later prehistoric phases. During the Roman imperial period, settlement shifted away from the plateau, while a large rural estate lay below its eastern side. Dense occupation returned to the hill in late antiquity.

The present research programme began in 2019\. Geophysical surveys, LiDAR mapping and excavation have revealed an organised settlement extending around the summit. One substantial masonry building on the surrounding plateau, dated to the sixth and seventh centuries, covered nearly 240 square metres. Its materials and complicated arrangement of rooms also suggest occupants with considerable resources.

## A church beside substantial stone buildings

The new three-year programme, launched in 2026, concentrates on the western part of the summit spur. A large church forms a central element of the complex. Excavation between 2019 and 2024 helped establish its religious function through traces of a chancel barrier, which separated the choir from the nave, and the bases of a possible liturgical bench.

The church measures 27.5 metres long and 12.4 metres across the nave, including its walls. A room on its southern side probably served as an annex for the clergy. Earlier investigations had already demonstrated the quality of its construction, including lime-rich mortar and abundant fragments of architectural ceramics and window glass.

Immediately west of the church, the 2026 excavation revealed another masonry building, 15 metres long and 12 metres wide, aligned with it. The thickness of its walls and the quality of the mortar suggest an upper storey. Test trenches south of the church have located a further stone construction extending for more than 20 metres, with its width still to be established.

![Archaeologists excavate the stone apse and choir of the summit church at Mesmont in 2022.](https://storage.ghost.io/c/aa/80/aa80281a-abce-4f35-865f-05153c8cc335/content/images/2026/10/mesmont-church-apse-2022.jpg)

The apse and choir of the summit church during excavation in 2022\. Credit: [A. Guicheteau, Inrap](https://www.inrap.fr/un-palais-sur-la-montagne-de-saint-laurent-mesmont-cote-d-or-20983?ref=romanempiretimes.com).

## Roman heating required skilled builders

The buildings together form an extensive complex laid out along perpendicular axes. Among the finds are small supporting pillars, fragments of ceramic ducts and pieces of *suspensura*, the suspended concrete flooring associated with a hypocaust. These remains identify an underfloor heating installation built in the ancient tradition.

The principle is familiar from [the hypocaust systems of Roman baths](https://romanempiretimes.com/ingenious-warmth-how-romans-heat-their-baths-with-the-hypocaust-system/): a raised floor created space for heat beneath the occupied room. At Mesmont, pillars and broken flooring were found gathered in a corner of the building excavated this year. Their presence places Roman heating technology within an early medieval architectural setting.

Inrap connects such comfort installations with patrons able to pay for specialist work. Brickmakers, lime burners and builders supplied the materials and expertise needed for these projects. The [manufacture of Roman bricks and tiles](https://romanempiretimes.com/forget-concrete-the-bricks-that-built-ancient-rome/) provides the wider background to those specialised ceramic components. Here, heating remains reinforce the evidence for privileged inhabitants supplied by the masonry and overall plan.

![Hypocaust pillar pieces and broken suspended-floor material beside a stone wall at Mesmont.](https://storage.ghost.io/c/aa/80/aa80281a-abce-4f35-865f-05153c8cc335/content/images/2026/10/mesmont-roman-hypocaust-fragments.jpg)

Hypocaust pillars and fragments of suspended concrete flooring in the building excavated in 2026\. Credit: [A. Guicheteau, Inrap](https://www.inrap.fr/un-palais-sur-la-montagne-de-saint-laurent-mesmont-cote-d-or-20983?ref=romanempiretimes.com).

## Pottery dates the complex, glass reveals its fittings

The current chronology places construction of the summit ensemble in the fifth century and occupation through the beginning of the eighth, without major remodelling. Pottery provides an important basis for that assessment, supported by a series of radiocarbon analyses. The dating therefore spans late antiquity and the first centuries of the medieval settlement.

A small group of red-slipped pottery produced in the Argonne region is particularly useful. A sherd recovered in 2026 carries roller-stamped decoration characteristic of the second half of the fifth century. Its Christian decorative scheme includes identifiable chalice and cross-monogram motifs, bringing a closely dated object into the developing picture of the complex.

More than 500 glass fragments have been recovered since 2019\. Most belong to lamps or tableware, which the team associates with privileged early medieval consumption. Approximately 50 are flat fragments with worked edges, probably from the church’s glazing. Two coloured pieces found during the church excavation in 2021 illustrate the material used to furnish the religious building.

![Two greenish coloured window-glass fragments from Mesmont, shown with a five-centimetre scale.](https://storage.ghost.io/c/aa/80/aa80281a-abce-4f35-865f-05153c8cc335/content/images/2026/10/mesmont-coloured-window-glass.jpg)

Two coloured flat-glass fragments with worked edges, found in the summit church in 2021\. Credit: [A. Guicheteau, Inrap](https://www.inrap.fr/un-palais-sur-la-montagne-de-saint-laurent-mesmont-cote-d-or-20983?ref=romanempiretimes.com).

## Mesmont belonged to Burgundy’s networks of power

The archaeological interpretation also draws on texts identifying Mesmont as the chief settlement of the *pagus magnimontensis*, a territorial district within the episcopal territory of Langres. Written sources call the place a *castrum* or *oppidum*, terms associated here with an elevated or fortified settlement possessing some urban functions.

Accounts of early Burgundian saints connect Mesmont with prominent ecclesiastical families. In the early sixth century, Gregory of Langres appointed his grandson Eustade, then a priest at Mesmont, to lead the monastic community founded around the cult of Saint Benignus at Dijon. They belonged to the Gregorii, a family rooted in the senatorial aristocracy of late antiquity.

These connections place Mesmont within [the aristocratic world of late Roman Gaul](https://romanempiretimes.com/sidonius-apollinaris-a-life-told-through-letters/) and its early medieval successors. Sigo, founder of the monastery now known as Saint-Seine-l’Abbaye, also came from Mesmont. The texts describe a place embedded in religious and political networks, while the excavated church, substantial buildings and expensive fittings give that regional importance a physical form.

## Excavations follow the settlement beyond the summit

Another religious focus may lie at the present parish cemetery, farther east on the hill. Its enclosure has a basilica-like outline ending in an eastern apse. Written records mention a medieval church there, and discoveries of graves and a sarcophagus lid add to the evidence for its funerary history.

The current campaign forms part of a continuing effort to understand the whole settlement. The 2023 field report had already distinguished the monumental summit from buildings on the lower plateau, including a later masonry structure overlying a smaller building with heating traces. Further excavation can clarify how these different areas functioned together and how their occupants used the hill.

At the summit, the strongest result is an architectural complex combining a large church, substantial neighbouring buildings and Roman-style heating across several centuries. The continuing investigation is examining how that complex fitted into Mesmont’s wider role as a centre of settlement and power, and who could command the resources reflected in its construction.

#### ****🏛️ Sources used:**

[Inrap, “Un palais sur la Montagne de Saint-Laurent à Mesmont (Côte-d’Or) ?” (12 October 2026; updated 13 October 2026).](https://www.inrap.fr/un-palais-sur-la-montagne-de-saint-laurent-mesmont-cote-d-or-20983?ref=romanempiretimes.com)

[Antoine Guicheteau and Régis Labeaune, “Le site de « La Montagne de Saint-Laurent » à Mesmont : des origines au haut Moyen Âge,” in Approche diachronique des sites de hauteur (ARTEHIS Éditions, 2023).](https://books.openedition.org/artehis/31674?ref=romanempiretimes.com)

[ARTEHIS, “La Montagne de Saint-Laurent à Mesmont (21), bilan de la campagne 2023,” excavation directed by Antoine Guicheteau.](https://artehis.ube.fr/la-montagne-de-saint-laurent-a-mesmont-21-bilan-de-la-campagne-2023/?ref=romanempiretimes.com)