A brief look at some recent genetic studies that indicate immigration from Gaul into Southern England and Wales, but not Scotland and likely not Ireland. Focusing on the Celtic language I strive to give an answer to this question, as well as when the Celtic language and culture first arrived in Britain and Ireland. I end up focusing more on the Gaels, because if the study is correct, it would demonstrate a direct genetic relation between the Welsh and Gauls, which some people take as the main marker of being a Celt.

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