Architecture of Scotland in the Roman era England. Around 141 CE they moved up to construct a new "limes", a sward-covered wall made of turf known as the Antonine Wall, the largest Roman structure in modern Scotland. They soon retreated to Hadrian's Wall, with occasional expeditions that involved the building and reoccupation of forts, until the collapse of Roman power in the early fifth century. Caledonia was the name that the Romans gave to the land north of their province of Britannia. In his "Geographia", Ptolemy, possibly drawing on earlier sources of information as well as more contemporary accounts from the Agricolan invasion, identified 19 "towns" in
Scotland artefacts. In 1924, another storm swept away part of one of the houses and it was determined the site should be made secure and more seriously investigated. The job was given to University of Edinburgh's Professor Vere Gordon Childe who travelled to Skara Brae for the first time in mid-1927. The written protohistory of Scotland began with the arrival of the Roman Empire in southern and central Great Britain, when the Romans occupied what is now England and Wales, administering it as a province called "Britannia". Roman invasions and occupations of southern Scotland were a series of brief interludes. According