May 26: First blood–libel case in France: Thirty–two Jews are burnt at the stake in Blois after the disappearance of a Christian child.
Rabbenu Tam (c. 1100 – 1171 CE), apparently in possibly the final year of his life, institutes a fast on the date of that event. He apparently also coordinated attempts by the Jewish communities in Paris and in Champagne to convince King Louis VII and the Duke of Champagne to halt the spread of anti–Jewish allegations.