One of the worst atrocities that ever happened to Jews, occured in York, England, in 1190.
I am not entirely sure that Christians still hold the the beliefs towards Jews that many of them held 800 years ago.
That was nearly 900 years ago.
It was bad, but with at max 150 murdered, it doesn’t go as “one of the worst” — not if you consider the 3 jewish-roman wars, the Maccabean wars etc. etc.