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Origin and history

The Larçay Castellum is a military fortification of the Roman Lower Empire (III century), built on a hilltop overlooking the Cher Valley, 10 km southeast of Caesardunum (Tours). Its modest area (3,150 m2) and its strategic position suggest a role of monitoring land and river routes, in a context of increasing insecurity (barbaric incursions after 250 AD). It partially reuses the materials of an earlier mausoleum of the I–II century, dismantled for its construction.

The construction, dated between 256 and 270, remains unfinished and the site is abandoned at the end of Antiquity. Remnants (court, U-shaped towers or circular towers) reveal a typical architecture of Gallic castellas: trimmings of limestone moellons, blocking core, and re-use of carved columns or blocks. The north wall, less thick, benefits from natural escarpment for its defense.

The site was mentioned in 1853 by local archaeologists (Louis Boileau, Jean-Jacques Bourassé) and searched between 1984 and 1987 by Jason Wood. This research confirms the medieval (Merovingian) and modern reoccupation (disturbing archaeological levels). It was listed as one of the best preserved Roman castellas in France in 1926, despite unbuilt or missing areas.

The historical context links its construction to a regional defensive program, including the fortification of Tours and other sites such as Chisseaux. Close to a major axis (Bourges–Tours) and an ancient aqueduct, the castellum had to control river and land exchanges. His abandonment coincided with the end of Roman administrative structures in Gaul.

The found archaeological furniture (currency of Constantine, sigillated pottery) remains rare and poorly located. Foundations, without masonated trenches, use dry stone beds or use elements (sawed column drums). The towers, initially trimmed like the courtine, show cracks revealing their subsequent addition to the wall.

Assumptions of its exact role (refugee, supervisory position) or the reasons for its failure (lack of resources, strategic change) remain open. The excavations of the 1980s also revealed traces of protohistoric occupation 200 m southwest, with no direct connection to the castelum.

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