So, here's my idea: in 1808 when Joseph Bonaparte is appointed King of Spain the Kingdom of Naples is not given to Murat, but instead merged with the Kingdom of Italy. OTL the King of Italy was Napoleon, but Eugène de Beauharnais, Napoleon's stepson, was the viceroy and, until the birth of an hypotetical second children of Napoleon, the heir to the italian throne, so ITTL seeing his kingdom expanding effortlessly he starts having fancy idea about the rest of Italy.
History is affected in minor ways but Spain is still a disaster and Russia a resounding defeat, when is clear that Napoleon has lost Eugene decides that he doesn't want to be on the losing side and join the sixth coalition occupying Tuscany and Rome. OTL he tried to put up resistance against the invading austrian, that ITTL reach Turin virtually unopposed. Napoleon is probably defeated earlier (the betrayal of Beauharnais convinces many of Napoleon not-so-loyal allies to switch side, this might also butterfly away the annexation of most of Saxony by Prussia).
Now it's time for the Congress of Vienna and Eugene decides to go personally, there he makes a good impression. At this point, ignoring possible butterflies, Austria still wants to give up the Netherlands, gain territories closer to Vienna and block a possible invasion from the south ence OTL Lombardy-Venetia was created, this might still happen ITTL, maybe Beauharnais manages to retain Milan. but probably not. As showed OTL with Bernadotte the great powers at Vienna didn't necessarly oppose the creation of a polity that didn't exist before the revolutionary war and didn't mind one of Napoleon's folk to lead it.
Leaving the Kingdom of Naples to Italy isn't a problem (they didn't have a problem with leaving it to Muarta OTL), the papacy wouldn't be a big deal either (the borders drawn at Vienna showed little regard to religion, which mean it wasn't their biggest concern, apart from Austria no one of the four great power were catholic, Austria itself feared OTL that the papacy may have become a spanish-alligned state. Also they didn't show any interest in restoring the various theocratic states of the HRE. It must be noted though that some of this points may be subjected to butterflies).
The various statelets that had existed in Italy wouldn't be restored, however we must consider what happens to Piedmont and Tuscany. Piedmont is restored to the house of Savoy as OTL, enlarged as OTL with Genoa and maybe Lucca. Tuscany would be left to Beauharnais, since it is being occupied by Italian troops, which probably means that Ferdinand III keeps Würzburg, so it also possible that Dalberg keeps the Granduchy of Frankfurt, or at least Aschaffenburg.
The capital of this Kingdom of Italy probably wouldn't be Milan (even if they manage to keep it: too periferical and surrounded by foreign states) so the three possible candidates are: Rome and Naples. Both have the advantage of being fairly central and developed city that had already been capitals. I'd say Rome is the most probable because of its long history of being the capital of the Roman Empire and then the Papacy (and Napoleon had also recently done some very nice renovations in the Quirinal Palace...), but Naples as capital is also an interesting not-often-seen possibility. In this later scenario the Royal Palace of Caserta may be built according to the original more lavish (and expensive) project. Eugène de Beauharnais OTL died in 1824 relatively young (43 years old) due to a stroke, which could be butterfly away (I'm no physician though and could be spectacularly wrong). His issues were all born after the POD so we can't know how his successors might look like.
The existence of this peninsula-spanning state would completely alter the makeup of european politics and so I won't make further predictions, still what do you think could probably happen as a result? Do you think such a polity existing is even plausible?
P.s. This is my first post, I might have done something wrong, in the event I apologize beforehand.
History is affected in minor ways but Spain is still a disaster and Russia a resounding defeat, when is clear that Napoleon has lost Eugene decides that he doesn't want to be on the losing side and join the sixth coalition occupying Tuscany and Rome. OTL he tried to put up resistance against the invading austrian, that ITTL reach Turin virtually unopposed. Napoleon is probably defeated earlier (the betrayal of Beauharnais convinces many of Napoleon not-so-loyal allies to switch side, this might also butterfly away the annexation of most of Saxony by Prussia).
Now it's time for the Congress of Vienna and Eugene decides to go personally, there he makes a good impression. At this point, ignoring possible butterflies, Austria still wants to give up the Netherlands, gain territories closer to Vienna and block a possible invasion from the south ence OTL Lombardy-Venetia was created, this might still happen ITTL, maybe Beauharnais manages to retain Milan. but probably not. As showed OTL with Bernadotte the great powers at Vienna didn't necessarly oppose the creation of a polity that didn't exist before the revolutionary war and didn't mind one of Napoleon's folk to lead it.
Leaving the Kingdom of Naples to Italy isn't a problem (they didn't have a problem with leaving it to Muarta OTL), the papacy wouldn't be a big deal either (the borders drawn at Vienna showed little regard to religion, which mean it wasn't their biggest concern, apart from Austria no one of the four great power were catholic, Austria itself feared OTL that the papacy may have become a spanish-alligned state. Also they didn't show any interest in restoring the various theocratic states of the HRE. It must be noted though that some of this points may be subjected to butterflies).
The various statelets that had existed in Italy wouldn't be restored, however we must consider what happens to Piedmont and Tuscany. Piedmont is restored to the house of Savoy as OTL, enlarged as OTL with Genoa and maybe Lucca. Tuscany would be left to Beauharnais, since it is being occupied by Italian troops, which probably means that Ferdinand III keeps Würzburg, so it also possible that Dalberg keeps the Granduchy of Frankfurt, or at least Aschaffenburg.
The capital of this Kingdom of Italy probably wouldn't be Milan (even if they manage to keep it: too periferical and surrounded by foreign states) so the three possible candidates are: Rome and Naples. Both have the advantage of being fairly central and developed city that had already been capitals. I'd say Rome is the most probable because of its long history of being the capital of the Roman Empire and then the Papacy (and Napoleon had also recently done some very nice renovations in the Quirinal Palace...), but Naples as capital is also an interesting not-often-seen possibility. In this later scenario the Royal Palace of Caserta may be built according to the original more lavish (and expensive) project. Eugène de Beauharnais OTL died in 1824 relatively young (43 years old) due to a stroke, which could be butterfly away (I'm no physician though and could be spectacularly wrong). His issues were all born after the POD so we can't know how his successors might look like.
The existence of this peninsula-spanning state would completely alter the makeup of european politics and so I won't make further predictions, still what do you think could probably happen as a result? Do you think such a polity existing is even plausible?
P.s. This is my first post, I might have done something wrong, in the event I apologize beforehand.
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