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Our knowledge of the Celts in Britain is slight. As with previous groups of settlers, we do not even know for certain whether the Celts invaded Britain or came peacefully as a result of the lively trade with Europe from about 750 B.C. onwards. At first, most of Celtic Britain seems to have developed in a generally similar way. ----. Consequently, this fall led to serious economic and political differences between the Celts of southeast Britain and those of the northwest.