Later, when Cologne was elevated to the status of a city, the Colonia Claudia Ara Agrippinensium, in 50 AD, the tower was integrated into the new city wall. Wooden piles were driven into the ground to secure the foundations in the silty soil on the banks of the Rhine. Based on dendrochronological examinations of the wooden piles, it was possible to determine that the piles were felled around 4th/5th BC. This means that the Ubier Monument can be dated to this period.
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