William of Norwich is the name of a young boy purported to have been killed by Jews in or about 1144, thus becoming the victim of the first recorded case of such a ritual murder in Western Europe and a seminal figure in the long history of antisemitism. His story is first told in Thomas of Monmouth's The Life and Miracles of William of Norwich, a work that elaborates the bizarre allegation, invented in twelfth-century England, that Jews...