In 2008 while doing construction work at St. John's College Oxford, workers discovered 35 medieval skeletons in a mass grave. They all adult males, all the victim of stab wounds, many of them burned (which was unusual) and piled haphazardly of top of each other.

In 1002, Aethelred the Unready responded to yearly Viking raids on England by ordering the extermination of all Danes in England (they had many colonies). The Danes at Oxford huddled themselves into the local Catholic church seeking refuge but were burned out and killed.

Archaeologists made this connection as soon as the skeletons were found, which was controversial, because archaeology is not supposed to be fun like a detective story. Four of the skeletons were sequenced in the Viking genomics paper. 3/4s were all Scando, one man 1/4th British.

The isotope data showed they were mostly local born though, people the townsman would have known. So it turns archaeologists got to play detective and they were vindicated and that's cool. But you know what's not cool? Being genocided by a bunch of haughty Oxford dons.