I’ve just been reading David Nirenberg’s history of antisemitism Anti-Judaism: The Western Tradition, and I came across the interesting letter 40 of Ambrose. Ambrose was Bishop of Milan for two decades in the late 4th century, and is considered one of the Fathers of the Church. The letter, addressed to the Roman emperor Theodosius, is framed as a plea for freedom and tolerance. And what is it that the “Godfearing, merciful, gentle, and calm” Theodosius has not sufficiently tolerated? It is the religious obligation to burn down synagogues.
In 388 a mob of monks in the Mesopotamian city of Callinicum burned down the Jewish synagogue and a gnostic Christian church. The local military governor ordered that the monks be punished and that the synagogue be rebuilt, at the expense of the local bishop, who had incited the attack.
There is, then, no adequate cause for such a commotion, that the people should be so severely punished for the burning of a building, and much less since it is the burning of a synagogue, a home of unbelief, a house of impiety, a receptacle of folly, which God Himself has condemned.
Ambrose goes on to remind Theodosius of the fate of his predecessor, who was thought too solicitous of the safety of Jews and their houses of worship:
Is it not on this account that Maximus was forsaken, who, before the days of the expedition, hearing that a synagogue had been burnt in Rome, had sent an edict to Rome, as if he were the upholder of public order? Wherefore the Christian people said, No good is in store for him. That king has become a Jew.
In other words, if you defend the Jews you might be suspected of being kind of a Jew yourself.