Quote Originally Posted by Slaists
Breaking an alliance diplomatically and then attacking the former ally still gives a reputation hit, by the way.
This is something I experienced - breaking an alliance diplomatically made my reputation go from Very Reliable to Reliable a few days ago, but today, when I broke my alliance with the Genoese to attack them, it went from Reliable to Very Reliable.

I thought it could be a mission from the Pope to break the alliance but it wasn't.