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Primary source: Cambridge encyclopedia of language.
The Celtic languages are divided into two classes: Insular and Continental
Insular Celtic is divided into:
P-Celtic consists of:
Q-Celtic consists of:
There were two waves of invasions to the British Isles which gave rise to the P/Q variaties we have today. The first invasion was to Ireland in the 4th century BC, probably from Western France. This variant became Gaelic and spread from Ireland to the Isle of Man and Scotland. The second invasion (P-Celtic) was to southern England and Wales and from there (in 5th century AD) to Brittany. Celtic languages have also spread from Britain. 150 Welsh speakers started a Welsh colony in Patagonia in 1865, and there is also a Scots Gaelic community in Cape Breton Island, Nova Scotia. (about 1,000 speakers today). Breton is not classified as continental Celtic because it came to Brittany from Britain. There was a Gaelic speaking community in the Carolinas but this died out in the early 20th century.
Pictish: The Picts were Celts but spoke a mixture of languages. They spoke a pre-Celtic language for ritualistic purposes (source: Prof Derek Thompson - "Why Gaelic matters"), and Pictish at other times. Pictish is mentioned The Cambridge Encyclopedia of language as possibly being Celtic or possibly being a non-Indo-European isolate like Basque. Thompson says "It is clear from the evidence of place names that there was much common ground between [Brythonic] and the Celtic constituent of Pictish". There is some debate as to whether Pictish was non IE or not, as there is so little information available on it.
Many of the Scottish Island names including Arran, Skye, Lewis and Jura are Pictish. For more information on placenames: (W.F.H. Nicolaisen "Scottish Place Names", Batsford, London 1976).