The Bulwarks, Porthkerry is a promontory fort in Rhoose, Vale of Glamorgan, on the southern coast of Wales overlooking the Bristol Channel. It probably dates to the Iron Age and continued to be occupied during the Roman period in Britain. The ramparts and ditches along the west side are well preserved, but the fortifications are heavily overgrown. Location The Iron Age fortification is one of several along the southern coast of Wales. The site was a strategically important position overlooking the Bristol Channel. The fort is on the end of a spur that faces west and overlooked the Porthkerry creek, now silted up. The natural slopes are very steep on the south east and north, but the ground is almost level towards the west. The south side is now bounded by the edge of the cliff along the shore, but probably there was originally a fortification along this side, since eroded away. The ramparts enclose an area of about . The fort is accessible via the Porthkerry caravan park. Fortification The Bulwarks enclosure is trapezoidal in shape. At present it is about from north to south, along the north side and along the south side. The cliff bounding the fort today has a recession rate of annually. Erosion along the south side has probably removed a strip about wide and in area. The defence consisted of three close-set banks separated by ditches. On the west the banks and ditches are well-preserved and about wide in total. On the other two sides only terraces remain where the defences once ran. The fort appears to have had just one entrance in the middle of the west side, at a slightly oblique angle to the rampart line, with gaps in the ramparts and causeways across the ditches. The interior is almost level and about above O.D. History Limited excavations indicate that the Bulwarks fort was occupied from the Iron Age into the Roman era. The camp was probably first occupied around 200 BC to 75 AD, before the Romans arrived in South Wales. Of the pottery remains from the military and then civilian occupation of the site, 26.7% is South-East Dorset Black Burnished Category I Pottery. In 1968 F. L. Davies excavated the site for the Department of the Environment. He found traces of three rectangular buildings just inside the innermost west rampart. Of these successive timber buildings, the earliest may have been