There is some justification for this. Lowland Scots and Northumbrian English are linguistically very similar, though the Gaelic-speaking area on the map does seem rather small. David Hackett Fischer in his excellent book Albion's Seed (about the way cultural differences among successive waves of British emigrants to the original 13 American colonies explain current regional variations in American culture) treats Northumbria, lowland Scotland and Ulster as a single cultural region, describing its inhabitants as "British borderers" instead of the more commonly used (but, Fischer argues, inaccurate) label of "Scotch-Irish".
Indeed, they were one and the same language at one time but diversified like Kernewek and Brezhoneg.
If the map was showing the linguistics of Scotland in 1938 it would not be too far off, probably even too generous to Gàidhlig, but it claims to represent the ethnography of the country and is totaly false.
I think it must have been trying to spread the "we're all Brittish" propoganda that was fed to Scots schoolchildren during the days of the Empire.
Hopefully, here's a map from L'Atlas mondial du moyen age. (1998)
Again, international scholars have no need to hide the veracity of Celtic countries. It would appeaer that it's only the English that are having to do so.
I have seen maps in the past showing the Anglo-Saxon arrivals, but they all had cute cosy little names like; The Coming of the English, or The English Settlement.
I see the one above is more realistic however - "Barbarian Invasions".
Mercator produced CORNWALL & WALES ("Cornewallia & Wallia") in 1564: http://www.walkingtree.com/
Sebastian Munster produced maps depicting Cornwall as a distinct region of Britain in 1538, 1540, and 1550.
George Lily produced a map showing Cornubia in 1556.
Girolamo Ruscelli did the same in 1561 portraying Cornubia alongside Anglia, Wallia and Scotia.
Johannes Honter followed this trend in 1561.
Humphrey Lhuyd and Abraham Ortelius produced Angliae Regni Florentissimi Nova Descripto in 1573, this showed Cornwall and Wales as distinct regions of England, however Cornwall was not portrayed as an English county. This map was re used in 1595 at about the same time that Norden produced the map of the Duchy of Cornwall.
From about 1600 things change the Mare Brittanica and the Celtic sea become the English Channel and Bristol/St Georges Channel respectively. At this time Cornwall also seems to become an English county.
Note also the reference in 'Foreshore Case' by Crown Officers:
The jurisdiction and consequent ownership of the Crown, as Lord of the Sea, has been defined, with respect to the British Channel, to extend midway between England and France, and to the middle of the sea between England and Spain, 3 Leon. 73, 5 Com. Dig. 102.
In Truro the other day, looking in the map shop. In the window was a large National Ordenance map of Roman Britain. Guess what?
ST GEORGES CHANNEL!!!!
Unbelievable!
I have sent messages to the two persons that take messages reminding them that Cornwall is not part of England and to the administrators of TIC.
I am assuming that many of you have done this sort of thing before , but I think we should keep bombarding them with more of the same until we win the day.
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