Sudbrook, Monmouthshire the Silures from the 2nd century BC and occupied by the Romans from the 1st century AD until the 4th century. The hillfort was originally much bigger than now having been eroded over the centuries. Finds of Roman coins at Black Rock, Portskewett, show that the ferry crossing was in use in Roman times, on the route between the Roman stations of "Aquae Sulis" (Bath) and "Venta Silurum" (Caerwent). According to tradition, Caradog Freichfras, the Welsh ruler of Gwent in the 5th century or 6th century AD, moved his court from Caerwent to the Portskewett area, possibly to the fort.
Celtic animism foci for healing cults: Sulis was prayed to as a healer at Aquae Sulis and the goddess Arnemetia was hailed as a healer at Aquae Arnemetiae. Nemausus, for example, was not only the Gallic name for the town of Nîmes but also that of its presiding spring-god. He had a set of three female counterparts, the Nemausicae. In the same region, the town of Glanum possessed a god called Glanis: an altar from a sacred spring is inscribed 'to Glanis and the Glanicae'. Meteorological patterns and phenomena, especially wind, rain and thunder, were acknowledged as inspirited and propitiated. Inscribed dedications