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On September 3, 1189, Richard the Lionheart was crowned in Westminster. Thirty Jews were massacred after the coronation - Richard ordered the perpetrators be executed. From the article:

"The lavish banquet that followed included 1,770 pitchers, 900 cups and 5,050 dishes. It was also an occasion to exchange the gifs. The freshly crowned king, for instance, gave the archbishop of Canterbury a huge ivory horn, that the archbishop chose to dispatch to the shire of St Thomas, Canterbury. It is believed that the first piece of music composed especially for a coronation to honour the new King was played at the festivities.

However, not everything ran smoothly that day. Richard barred all Jews and women from the investiture, but some Jewish leaders arrived to present gifts for the new king. Richard’s courtiers stripped and flogged the Jews, then flung them out of court. Rumours spread that Richard had ordered all Jews to be killed. The people of London believing this to be true attacked the Jewish population. Many Jewish homes were burned down, and several Jews were forcibly baptised. Some sought sanctuary in the Tower of London, and others managed to escape. Richard punished the perpetrators and ordered the execution of those responsible for the murderous rampage and persecutions, including rioters who had accidentally burned down Christian homes. He allowed a forcibly converted Jew to return to his native religion and distributed a royal writ demanding that the Jews be left alone."