In March 1190 the entire Jewish population of York estimated to be 150 men, women and children had fled to the Tower for protection from an antisemite mob.
The Tower was set alight. Most of them decided to commit suicide rather than surrender to the mob. Those who did surrender were slaughtered.
Jews were also being murdered in London and Norfolk.
Least we forget are own shameful history.
Hat tip https://www.english-heritage.org.uk/visit/places/cliffords-tower-york/history-and-stories/history/