You are probably refering to Pope Clement VII of Avignon which was elected pope by the French Cardinals opposing Pope Urban VI.

There hae been instances in history where tehere were 2 Popes in the Catholic Church, the above being one of them, this resulted in Excomunication but never Crusades.

Maybe the game lacks that mechanic to better represent History. Excommunication was wiedly used as a weapon by the Church back then.

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