From Wikpedia[1]:
>Blood libel or ritual murder libel (also blood accusation) is an antisemitic trope which falsely accuses Jews of murdering Christians in order to use their blood in the performance of religious rituals... Blood libels often claim that Jews require human blood for the baking of matzos, an unleavened flatbread which is eaten during Passover. Earlier versions of the blood libel accused Jews of ritually re-enacting the crucifixion. The accusations often assert that the blood of Christian children is especially coveted, and historically, blood libel claims have been made in order to account for the otherwise unexplained deaths of children. In some cases, the alleged victims of human sacrifice have become venerated as Christian martyrs. Many of these – most prominently William of Norwich (1144), Little Saint Hugh of Lincoln (1255), and Simon of Trent (1475) – became objects of local cults and veneration