Unification of Italy under Pope in end of XV century

After the death of Lorenzo de' Medici (1492), Papal State bring Tuscany. Than, Pope Alexander VI, put his son Giovanni Borgia on the throne of Naples. The other son, Cesare Borgia, occupy the northern duchies, Milan and Turin. Starts to be a federation of Italian States under lead by the Pope. The federation is joined by Republics of Venice and Genoa too. Italy, therefore, starts to be a Federeation lead by the Pope at the end of XV century-start of the XVI.
What would happen?
 

Redhand

Banned
I am going to assume that neither the Emperor or the King of France will allow this to happen.

The Papacy had a brief period of military ascendancy in Italy under the Borgias, but it was very brief.

I can see most of Italy caving to the Papacy at least for the short term, but the Venetians are a little bit different. They had the treasury to pay for the mercenaries that were so crucial in Renaissance Warfare, and a navy to terrorize the rest of Italy with.

It will just be a question of what the Spanish, HRE, and French end up getting when they depose the upstart Papal States.
 
Cesare Borgia could have survived, politically and physically, the death of his father, but he needed to keep under huge influence Rome itself, foreign and far expeditions forcing him to abandon it and, as IOTL, to be crushed trough political backleash.

Putting Cesare on the throne of Naples is probably the best way to piss Charles VIII, that wanted it for him, and Aragon that had it.

There's no way in cold hell that Venice and Genoa would have relinquished their independence and international power facing an uneasy "federation" (Pope playing all King of Italy would probably be a huge obstacle when facing entities as Duchy of Milan, Modena and basically every Italian state, to not speak of inner opposition).

Simply said, papacy didn't had the kind of power or legitimacy to do that, and while it's possible to see it imposing its authority in Central italy (both by taking Romagna back into its suzerainty, and influencing Tuscan city-states), more would be definitely out of its reach.
 
Although the King of France might be unhappy with the confederation and theoretically possess enough power to stop it, that does not mean they will.

Charles VIII beneficied from a quite unrivaled hegemony on his kingdom

Really, the only important princes in France at this point were Pierre II of Bourbon that disapproved the expedition; Charles d'Orléans and Louis of Orléans that were part of the court and argued of Milanese legacy, and Foix and Albret gascon/pyreneans vassals.
Brittany was, by marriage, under Valois control
France of the late XVth wasn't the same kingdom with really important princes that rivaled royal power. At this point the whole "vassals could and did often ignore it" was no longer a thing and wouldn't be something anew before the Wars of Religion.
The military ordinances mixing standing armies and feudal levies are particularly telling on this.

It's why Charles VIII managed to gather and prepare Italian Wars in first place.
 
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