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The Celts are much more closely identified with Scotland, Ireland, and other points in the greater British Isles, but they started in continental Europe.

Wow. Thanks for updating me bro

Indeed.

The Celts had made some minor inroads into the British Isles prior to the Norman Conquest (AD 1066) and its aftermath, but that was when they first settled there en masse, and from that point forward, there were waves of population exchanges going both ways.

And there were strong ties, particularly between Scotland and France, throughout the Middle Ages.