This study considers genetic events that affected Britain during the period bracketed by the arrival of Bell Beakers about 2450 BC down to the beginning of the Roman conquest in AD 43. Within this span two major population shifts occurred. A great population turnover coincided with the arrival of the Beakers bringing steppe ancestry. This was followed, in the Late Bronze Age and the beginning of the Iron Age, by the more gradual impact in southern Britain of incomers who had higher levels of European Early Farmer (EEF) ancestry than that found in the Early Bronze Age Britisn population. The genetic impact of these newcomers gradually spread across England, but not to Scotland. When did (Proto)-Celtic speakers arrive in Britain? We argue that the most plausible time is around 1000 BC coincident with the observed genetic shift.
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