Scotland during the Roman Empire of the geography of Scotland had extended to the "Hebudes" (The Hebrides), "Dumna" (probably the Outer Hebrides), the Caledonian Forest, and the Caledonians. Ptolemy, possibly drawing on earlier sources of information as well as more contemporary accounts from the Agricolan invasion, identified 18 tribes in Scotland in his "Geography", but many of the names are obscure. His information becomes much less reliable in the north and west, suggesting early Roman knowledge of these area was confined to observations from the sea. Famously, his coördinates place most of Scotland north of Hadrian's Wall bent at a right angle, stretching due eastward
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