Sicut Judaeis

The bull forbade Christians, on pain of excommunication, from forcing Jews to convert, harming them, taking their property, disturbing the celebration of their festivals and interfering with their cemeteries.

Around 400, St Augustine, one of the most influential and foundational figures of Catholic theology, preached that the Jews must be protected for their ability to explain the Old Testament.

Around 598, in reaction to anti-Jewish attacks by Christians in Palermo, Pope Gregory brought Augustine's teachings into Roman law.

"[5] The Bull said that Jews should be treated equitably and justly, that their property rights should be protected, and that they should keep their own festivals and religious practices.

[6] In 1065, Pope Alexander II wrote to Béranger, Viscount of Narbonne, and to Guifred, bishop of the city, praising them for having prevented the massacre of the Jews in their district, and reminding them that God does not approve of the shedding of blood.