It's been 1300 years since the Vikings appeared in East Anglia, and look at this map.https://twitter.com/paul1kirby/status/740290301051449344 …
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Dunno if you're really interested in this, but Vikings actually had almost no genetic impact on UK: http://dienekes.blogspot.com/2015/03/british-origins-leslie-et-al-2015.html …