IOTL, after the capture of Rome by the Italian army, Pope Pius IX refused to yield his claim to the entirety of the Papal States. The Papacy and the Italian kingdom would remain at odds until Mussolini came to power.
What if things got worse?
Instead of the Prisoner of the Vatican, Pope Pius IX becomes the Martyr of the Vatican. An Italian nationalist assassinates him shortly after Rome falls, declaring something to the effect of 'all who stand in the way of the fatherland will end the same way' when he's arrested.
Exactly how badly could that mess up Italian-Catholic relations in the future?
Would the Papacy relocate?
What if things got worse?
Instead of the Prisoner of the Vatican, Pope Pius IX becomes the Martyr of the Vatican. An Italian nationalist assassinates him shortly after Rome falls, declaring something to the effect of 'all who stand in the way of the fatherland will end the same way' when he's arrested.
Exactly how badly could that mess up Italian-Catholic relations in the future?
Would the Papacy relocate?