I'm Austria and I conquered Shadow kingdom. and it's 1510s Papa still doesn't join HRE. why?
There is the "The Pope and the Emperor" incident, where they can choose to join via the "A Holy Empire?" event. You can check whether you fulfill all the conditions. One thing I can see in the game files, that's not listed on the wiki is that the AI will never choose to join if they rival the Emperor (or vice versa).I thought there would be an imperial incident for Papa to join hre
There is the "The Pope and the Emperor" incident, where they can choose to join via the "A Holy Empire?" event. You can check whether you fulfill all the conditions. One thing I can see in the game files, that's not listed on the wiki is that the AI will never choose to join if they rival the Emperor (or vice versa).
When you say "resolve the Shadow Kingdom", you mean make the italian provinces back into the HRE?No, it can and will happen directly after you resolved the shadow kingdom (in that you kept them in). In addition to that though, the Pope may not have more than... 8? provinces or so. I assume this is not the case for you.
The Pope will LEAVE the HRE if you sign the Peace of Westphalia or get the Erbkaisertum before the Religious War finished though.
He won't because the religion of the HRE has been enforced. The incident the others have talked about is designed to bring them into the HRE after the Shadow Kingom is resolved/'won' by the player (or I guess the AI too if it wasn't incapable), but before the League War. Since you are beyond that, your option is to use the Expand Empire CB, but that requires that the Pope have less than around 79% warscore for the total of his provinces. You could also vassalize him, but as a Catholic that has its own maluses (-2 diplo rep IRC), so generally it's not advisable to do that. If you manage to Expand Empire on him, that's your surest way.Will he join the HRE?
Can I use the Expand the Empire CB on the Papal States?
Can I just vassalize the Papal States in a peace deal?