Sicut Judaeis (Latin: "As the Jews") were papal bulls which set out the official position of the papacy regarding the treatment of Jews. The first bull by that name was issued in about 1120 by Calixtus II and served as a papal charter of protection to Jews. It was prompted by attacks on Jews by the First Crusade, during which over five thousand Jews were slaughtered in Europe. The bull forbade Christians, on pain of excommunication, from forcing Jews to convert, from harming them, from taking their property, from disturbing the celebration of their festivals, and from interfering with their cemeteries.