Through a Black Hole into Parallel Universes

The Anglo-Saxon immigration of the 5th-6th centuries AD led to a dual contact situation in the British Isles: with the native inhabitants of the settlement areas in south-eastern England (internal contact zone), and with the Celtic polities outside the Anglo-Saxon areas (external contact zone). In the internal contact zone, social and ethnogenetic processes resulted in a complete acculturation of the natives by the 9th century. By contrast, the external contact zone between Anglo-Saxon and Celtic polities resulted in a cultural and linguistic split right across the British Isles up to the 7th century, and arguably well beyond. The cultural boundary between these two domains became permeable in the 7th century as a consequence of Anglo-Saxon Christianization which created a northern communication zone characterized by a distinct art style (Insular Art). In the early medieval British Isles, contact resulting from migration did not lead to cultural exchange for about two centuries, and it took profound ideological and social changes to establish a basis for communication.