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 during the Roman Empire to purchase truces from the natives, and eventually the spread of Christianity. The Ravenna Cosmography utilises a 3rd- or 4th-century Roman map and identifies four "loci" (meeting places, possibly markets) in southern Scotland. "Locus Maponi" is possibly the modern Lochmabenstane near Gretna which continued to be used as a muster point well into the historic period. Two of the others indicate meeting places of the Damnonii and Selgovae, and the fourth, "Manavi" may be Clackmannan. From the time of Caracalla onwards, no further attempts were made to permanently occupy territory in Scotland. The intermittent Roman presence in Scotland coincided with