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The Celts are a category of Europe peoples with a common ethnic, cultural and linguistic heritage. Many Celtic subgroups used to be adversaries of the Roman Empire, while others later embraced elements of Roman culture. Today, the peoples of Brittany, Cornwall, Ireland, the Isle of Man, Scotland and Wales make up the six Celtic nations with surviving Celtic languages. Additionally, the people of Galicia in Spain claim Celtic heritage, although no Celtic language survives in the region. As well the Celts were part of the mass migration of Europeans to North America and Oceania, so that there is a notable Celtic cultural presence in much of the settler societies of the post-colonial world.