Sicut Judaeis (the "Constitution for the Jews") was a papal bull setting out the official position of the papacy regarding the treatment of Jews. The first bull was issued in about 1120 by Pope Calixtus II and was intended to protect Jews who suffered during the First Crusade, during which over five thousand Jews were slaughtered in Europe. The words "Sicut Judaeis" ("and thus to the Jews") were first used by Pope Gregory I (590-604) in a letter addressed to the Bishop of Naples. Even then the Pope emphasized that Jews were entitled to "enjoy their lawful liberty."