Such an experience of changing visual perspectives is largely lost in academic publication, yet it must have been a preeminent aspect of how hillfort builders and users described and understood hillforts." In the 1st century, southern Britain was conquered and absorbed into the Roman Empire, leading to the creation of a hybrid Romano-British culture within what is now known as Roman Britain. It appears as though settlement ceased at many hill forts in Roman Britain. For instance, excavators working at the Dinas Powys hillfort in the Vale of Glamorgan, southern Wales, noted that although artefacts that were clearly Romano-British in nature were found at the site, they were not found in sufficient quantities to imply settlement, and that there was also no evidence of any construction going on during the first four centuries of the Common Era. They concluded therefore that under Roman rule, Dinas Powys had been effectively abandoned. In the extreme southwest, however, enclosed settlements, albeit on a much smaller scale, continued to be constructed such as at Chysauster or the 'Rounds' found in Cornwall—presumably reflecting a lesser degree of Roman influence, which continued through into Sub-Roman Britain. The Roman Empire never occupied northern Britain (which at this time was largely the geographical equivalent to the later nation-state of Scotland), and as such a native British Iron Age culture was able to continue here with less imperial interference. This had some bearing on the nature of hill forts in this period. Archaeologist Leslie Alcock noted that a fort-building hiatus in the early centuries [CE] was followed by a new wave of construction—beginning in the third century, gathering momentum in the fifth, and perhaps extending through to the eighth. Also, out of all northern forts with radiometric dates, about half were either earlier forts that had been refurbished in the later period, or were newly constructed on virgin sites in the later period. In the Early Medieval period, which began in the fifth century CE, much of southern Britain (comprising much of the area that later became the nation-state of England), adopted a variant of Germanic culture from continental Europe, likely due to migration from that region. These Germanic peoples, the Anglo-Saxons, typically did not build or re-use hillforts. However, in Northern and Western Britain, areas that retained a cultural link to the earlier Iron Age, hillfort use continued. After looking at the difference between Iron Age and Early Medieval hill forts, archaeologist Leslie Alcock thought it reasonable to infer that Political and social conditions that demanded the massive pre-Roman Iron Age hillforts—and had the labour to build them—no longer existed in [the fifth and sixth centuries CE].