Yeah, I think I've seen that happen once or twice. If I remember correctly: In one game, Toulouse was inherited by a Germanic Pagan kid, still sometime in the 900s, which was enough for the Pope to call for a crusade. Not against the kid, since he was a vassal of a Catholic emperor of Francia, but against some heretics in England.Maybe it's not the top liege that triggers crusades, but the one who holds the title, and as that one is still catholic....
Hmm...don't know.Just speculation.
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