St. Brice’s Day Massacre: Æthelred’s Order Explained Brice's Day Massacre happened in 1002 and it was where the English king Æthelred gave out this order that all Danes in England were to be killed. This was on November 13th 1002. And we have pretty good evidence that that order was carried out in some places Æthelred himself in a charter from a couple years later boasts about it. #vikings #england #history #worldhistory