Between August and October of this year, the Landesamt für Denkmalpflege (LAD) of Stuttgart, Germany, conducted a new phase of archaeological investigations in Altenburg, located in the municipality of Jestetten, just a few kilometers from the Rhine Falls. This site, known as the oppidum of Altenburg-Rheinau, was one of the largest and most significant Celtic settlements north of the Alps during the 1st century BC.

The findings have shed light on the daily life of this community and highlighted the central role of this city in Mediterranean trade and as a hub of specialized artisanal activities.

The oppidum of Altenburg-Rheinau occupies two peninsulas: the Schwaben peninsula, on the German side, and the Au peninsula, on the Swiss side, both enclosed by defensive walls. Previous research, such as the studies conducted in the 1970s by the University of Tübingen, had already provided information about the organization of the settlement over a total area of 320 hectares.

Oppidum Altenburg-Rheinau
Aerial view of the double loop of the Upper Rhine. The late Celtic oppidum extended over a total area of 320 hectares on the two opposing peninsulas. Credit: Christoph Steffen / LAD

The most recent excavations, carried out between 2022 and 2024 by the LAD, have expanded our knowledge of the structures and activities at this site.

During this year’s campaign, conducted in areas near the main defensive wall known as “Schanz,” multiple filled pits were identified. According to Dr. Günther Wieland, project director and specialist in the Metal Ages, these pits, up to 2.5 meters deep, exhibit distinct fill layers and were likely originally used for food storage. Additionally, remnants of underground structures with access through ramps or earthen stairs were discovered, possibly serving as cellars or storage facilities.

However, evidence of residential buildings is scarce. Only one square-plan post structure was uncovered, interpreted as a possible warehouse rather than a dwelling.

Oppidum Altenburg-Rheinau
One of the 2024 excavation areas: after removing the topsoil, large discolored storage pits are visible. Credit: Francois Ohl / LAD

Among the most remarkable finds are fragments of local ceramics and imported items such as Italian amphorae used to transport wine, a luxury good highly prized by the Celtic elite. Numerous Celtic coins were also recovered, evidence of a monetary economy that facilitated long-distance trade.

According to Wieland, these discoveries confirm the existence of a well-structured trade network connecting the oppidum with the Mediterranean.

An exceptional find was a bone stylus, a writing instrument used to inscribe on wax tablets, discovered during the 2023 excavations.

Oppidum Altenburg-Rheinau
Late Celtic fibulae from the 1st century BC (garment clasps) made of bronze and iron. Credit: Yvonne Mühleis / LAD

This object not only demonstrates the use of writing at the settlement but also underscores the administrative and economic sophistication necessary to sustain extensive trade exchanges.

Personal items discovered, such as fibulae and bronze and iron buckles decorated with intricate designs, provide insights into the daily life and fashion of the oppidum inhabitants. Additionally, the analysis of animal bone remains, mostly cattle, suggests an economy based on organized livestock farming and specialized meat production.

The excavations would not have been possible without the collaboration of volunteers and logistical support from the local community. In October, numerous individuals had the opportunity to visit the site and witness ongoing research. Looking ahead, new excavations are planned for 2025, aiming to further unveil the secrets of this fascinating Celtic settlement.



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