The Roman fort in Bonna was one of the largest military camps in the Roman Empire. It was located in what is now known as the Bonn-Castell district. The fort was in continuous use as a military base from 35 - 430 AD, predominantly by the much revered Legio I Minervia. Traces of the fort’s layout are still visible in the street plan of the present-day city. The centre of the camp occupied the area where Römerstraße and Nordstraße/Badener Straße now meet. These would have been known as Via Principalis and Via Praetoria during the Roman period. Around 83% of the structures are still buried underground. Copies of stones inscribed in Roman letters, a reconstruction of a Roman treadwheel crane, a recreated barracks building and a replica of an early Christian church can now be found on the fort’s original site.
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