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Origin and history

The bricking of the Seille is a major archaeological complex of the Iron Age, consisting of massive accumulations of terracotta, remains of a "proto-industrial" exploitation of the natural salt springs of the Seille Valley, south of the Moselle. This waste comes from the production of salt by heating brine in clay stoves and moulds, a technique abandoned in the early Roman era to the benefit of salt stoves. The term "brickery", introduced in the 18th century by the Royal Engineer Artézé de la Sauvage, refers to these clusters of ceramics discovered during the fortification works of Marsal under Vauban.

The exploitation of salt in the valley probably begins as early as the final Neolithic, but it is in the sixth century BC that the technique of bricking develops, with workshops scattered over 11 km, from Salonnes to Marsal. A first phase (VIth–early 5th century BC) saw sites of 1 to 5 hectares abandoned early, while a second phase (IIth–I century BC) concentrated production in three major centres (Vic-sur-Seille, Medievic, Marsal), reaching a proto-industrial stage. The waste, released into the channels, contributed to the siltation of the valley, creating marshes used as a natural defence until the modern era.

Modern excavations, particularly those carried out by Laurent Olivier (2001–2017), revealed a complex social organization: the workshops of the sixth century BC were probably managed by an elite, as evidenced by gold-painted burials, while a local and dependent labour force, suffering from labour-related trauma, appeared in the fourth century BC. The brickmaking technique, abandoned under the Romans, left lasting environmental traces, transforming the valley into a swampy area until the 19th century drainages.

The site of Marsal, classified as a historical monument in 1930, illustrates this history with accumulations of brickwork up to 7.50 m thick, mixing remains of old and recent phases. Geophysical and archaeological research has helped to reconstruct the production chain: filtration of brine in argile basins, heating in basin furnaces, and casting salt into breads. The discharges, consisting of basins, mussels and oven grills, offer a unique testimony of Celtic and Gallic techniques.

Nearby funeral discoveries, such as the gold graves of the 6th century BC or the collective burials of the 4th century BC, highlight a marked social hierarchy. DNA and isotopic analyses reveal a local labour force without family ties, suggesting a system of forced labour, perhaps hereditary. This heritage, studied since the 18th century, remains one of the most important salt production sites in ancient Europe, reflecting the technical innovation and environmental impact of Iron Age societies.

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