The Church foolishly tried to convert jews, it was a big mistake to invite them into Christianity and allow them to enter the priesthood. However, all of Christianity, for about 1900 years was consistent in understanding Christians were the spiritual heirs of Abraham, jews were not the "chosen people." So, there was none of the jew love you see today with "Christian" Zionism.

And, you're right about the kings. jews were allowed in Europe by kings as tax farmers. Our problem with jews has always been primarily political, not religious. Christianity actually provided more protection from them than Paganism, because it gave a history of jews being a cursed people, that's consistent in the Bible:

1: Judah - the bad son who sells his little brother into Slavery. (He does other bad things too.)
2: The Kingdom of Judah - destroyed by the Babylonians as willed by God for their unfaithfulness.
3: jews cursed in Malachi again for unfaithfulness.
4: Judas - betraying Jesus
5: jews killing Christ
6: The destruction of Jerusalem
7: jews described as the Synagogue of Satan

I can't think of one Early Church father who had anything good to say about jews, but there's a ton of condemnations. And, I know of no Pagan book comparable to the Bible in it's diatribes about jews. There were individual Pagans who were critical of jews, because jews excite animosity everywhere they go. But if you want an antisemitic religion, it's Christianity.