Beneath the surface of Aardenburg, a small town in the south-western part of the Netherlands, lie the remains of a Roman settlement that is presumed to have been named Rodanum. Extensive archaeological excavations from the late 1950s to the late 1980s revealed that the settlement was similar in size or even larger than the modern town. Its centre was formed by a large castellum-type fortification wall that enclosed several large stone buildings. The settlement was connected to the sea by a natural watercourse that defined its economic and logistical importance in the region. Rodanum's...