The history of the British Isles and Ireland is characterized by multiple periods of major cultural change, including the influential transformation after the end of Roman rule, which precipitated shifts in language, settlement patterns and material culture1. The extent to which migration from continental Europe mediated these transitions is a matter of long-standing debate2–4. Here we study genome-wide ancient DNA from 460 medieval northwestern Europeans—including 278 individuals from England—alongside archaeological data, to infer contemporary population dynamics. We identify a substantial increase of continental northern European ancestry in early medieval England, which is closely related to the early medieval and present-day inhabitants of Germany and Denmark, implying large-scale substantial migration across the North Sea into Britain during the Early Middle Ages. As a result, the individuals who we analysed from eastern England derived up to 76% of their ancestry from the continental North Sea zone, albeit with substantial regional variation and heterogeneity within sites. We show that women with immigrant ancestry were more often furnished with grave goods than women with local ancestry, whereas men with weapons were as likely not to be of immigrant ancestry. A comparison with present-day Britain indicates that subsequent demographic events reduced the fraction of continental northern European ancestry while introducing further ancestry components into the English gene pool, including substantial southwestern European ancestry most closely related to that seen in Iron Age France5,6.

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This paper identifies and discusses two contrasting approaches to field archaeology in contemporary Britain. The dominant approach is that of 'official archaeology' rooted in professional rescue (or contract) work and represented by bodies such as English Heritage, county archaeology units and the Institute of Field Archaeologists. This 'archaeology from above' threatens alternative approaches to fieldwork, since state legislation and other bureaucratic controls are being used to restrict access to archaeology to an elite of self-accredited practitioners, and a persuasive and sophisticated ideology of heritage 'protection' and professional 'standards' is being deployed to legitimize this policy. This attempt to universalize the practices of professional rescue archaeology is academically incoherent and politically undemocratic. An alternative 'archaeology from below' is proposed in which fieldwork is rooted in the community, open to volunteer contributions, organised in a non-exclusive, non-hierarchical way, and dedicated to a research agenda in which material, methods and interpretation are allowed to interact. These points are illustrated with detailed references to the experience of 'democratic archaeology' on the author's project at Sedgeford in northwest Norfolk in 1996-98.

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