Thanks for both the info and your reply. Interestingood guess! I'm actually half-Welsh, half-English, with some Scots and Irish thrown in a few generations back.
As for the questions, as Morticia mentioned there's the Silures and Caractacus. Ynys Mons/Anglesy, which is an island off the northern coast of Wales, was also a major centre of Druidic power in Britannia. When Rome wanted to break the power of the Druids in 60AD they attacked it. As wikipedia puts it: