Description: Lieges of antipopes (either direct or up the in hierarchy) cannot be targeted by depose antipope casus belli. I would guess that it happens when an antipope installer later becomes someone else's vassal.
Save games:
1. https://drive.google.com/file/d/0B9Cz8k4ubpa4Wk9ua1g0aDBHRk0/view?usp=sharing
Here the antipope is vassal of an ERE count and between the ERE emperor and the count there are a duke and a king. No one outside of ERE can declare any war against the count, duke and king (them being not independent) and the ERE emperor himself is not target of despose antipope CB most likely because he's not the direct liege of the antipope.
Solution here was to fabricate a claim on count's county and win the war again the ERE emperor. The antipope then become my direct vassal and I pushed his claim on the papacy. At this point the pope is my vassal and later in the game it gets even funnier ...
2. https://drive.google.com/file/d/0B9Cz8k4ubpa4bzBpWTJfSERCT3c/view?usp=sharing
Same game, years later. Another antipope who's liege cannot be targeted by depose antipope CB. Same solution - fabricate claim on direct liege, win the war and now I'm the direct liege of both the legitimate pope and antipope.
Save games:
1. https://drive.google.com/file/d/0B9Cz8k4ubpa4Wk9ua1g0aDBHRk0/view?usp=sharing
Here the antipope is vassal of an ERE count and between the ERE emperor and the count there are a duke and a king. No one outside of ERE can declare any war against the count, duke and king (them being not independent) and the ERE emperor himself is not target of despose antipope CB most likely because he's not the direct liege of the antipope.
Solution here was to fabricate a claim on count's county and win the war again the ERE emperor. The antipope then become my direct vassal and I pushed his claim on the papacy. At this point the pope is my vassal and later in the game it gets even funnier ...
2. https://drive.google.com/file/d/0B9Cz8k4ubpa4bzBpWTJfSERCT3c/view?usp=sharing
Same game, years later. Another antipope who's liege cannot be targeted by depose antipope CB. Same solution - fabricate claim on direct liege, win the war and now I'm the direct liege of both the legitimate pope and antipope.
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