Being papal controller in itself does not lower infamy; each cardinal in the Holy Sea that you control lowers infamy by 0.10/year though.
Releasing vassals reduces infamy by 2 per province that they get. That's the best way to instantly lower infamy. There are a few events that you get which lower infamy too but they cannot be relied upon.
Being a member of the HRE reduces infamy by 0.25.
Releasing vassals reduces infamy by 2 per province that they get. That's the best way to instantly lower infamy. There are a few events that you get which lower infamy too but they cannot be relied upon.
Being a member of the HRE reduces infamy by 0.25.