Why did Æthelred the Unready order the St Brice’s Day Massacre in 1002?

On the 13th November 1002, the St Brice’s Day Massacre took place when king Æthelred the Unready “ordered slain all the Danish men who were in England”.
On the 13th November 1002, the St Brice’s Day Massacre took place when king Æthelred the Unready “ordered slain all the Danish men who were in England”.
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