There's also a good book about the jewish popes that basically rescued the church so it could go on to be the contagion it is today. The Pierleoni family were early Rothchild types.
https://en.wikipedia.org/wiki/Pierleoni_family
Popes from the Ghetto. Recommended reading.
https://www.amazon.com/Popes-ghetto-.../dp/B0007E04QO