I have started playing CK2 as a Count of Olomouc, which means I am part of the Holy Roman Empire. But probably because of that, I constantly get messages like this one in Low Priority Messages:
Duke Heinrich VIII now favors Duke Magnus I as the heir to the Holy Roman Empire.
I want to read all the other low priority messages, but not these, they don't seem relevant to me (at least for now) and they are very frequent.
I went through the Message Settings, but didn't find any option for this. Which of the many options controls these messages? Or is there some other way to turn them off? (Shift + Discard is not good enough for me.)