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There were plans afoot in the 1680s to marry Vittorio Amedeo II of Savoy to Anna Maria Luisa of Savoy. Likewise, in the following generation there were plans to marry Vittorio Amadeo, Prince of Piedmont, to Isabel Farnese. Either marriage, had it produced children, would've seen Savoy acquire either the duchy of Parma or the grand duchy of Tuscany.

Now for the WI: Anna Maria Luisa gets married to the Savoyard duke, and produces a couple kids, including a son. That son, let's call him Vittorio Emanuele, Prince of Piedmont, marries an alt-Isabel Farnese who is likewise heiress to the duchy of Parma.

Admittedly, this needs a rather strict butterfly net to keep Anna Maria Luisa/Isabel as the sole heiress to their domains - (or maybe not, IDK), but how would this change 18th century politics?

OTL, when the Savoys united Italy by conquest in the 19th century, they found themselves sort of on the outs with the Bourbons and the Habsburgs for deposing relatives ruling in Florence, Parma, Modena and Naples. Here, the Savoys are simply emulating those families by arranging strategic marriages that end up putting a large portion of Italy under the Savoyard flag. Any thoughts?
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