European royalty and Genealogy-Wank: Alternative Family Trees and Political Marriages

As we all know, political marriages played a great part in diplomacy and politics of European royal/noble families. The fate of a continent was shaped much by the matchmaking practiced amongst the greatest and most powerful families of Europe.

The proposal of this thread is to explore the universe of political marriages from 15th to 19th centuries, creating and reinventing many of the most important family trees of European Nobility/Royalty, leading to new families, territories and outcomes in a series of "what ifs" on the marriage subject.

As I can see, many people here are undeniably interested in such subject. Many threads I have already seen here: what if X heiress had married Y powerful king? What would have happened if Z prince had survived? How to make the line of descent of [insert OTL childless noble here] survive until the present day? And so on...

I'd like to start the discussion with the following topic:

Different matriarchs for European royalty?
Anna of Bohemia and Hungary, Barbara of Cilli, Anna Gonzaga of Simmern, Maria Theresa of Austria and Hungary, Marie Leszczyńska and Eleonore d'Esmier d'Olbreuse are examples of matrilineal ancestresses whose genealogical mark on European royalty is impressive. Except maybe for the last one, Eleanore, all the others have extant female-to-female lines living up to the present day. The first cited, for instance, is the direct matrilineal ancestress of Emperors, Empresses, Kings and Queens, few exemples: Victoria of Great Britain, Christina of Sweden and Catherine II of Russia, also present day monarchs such as Carl XVI Gustaf of Sweden and future Philip VI of Spain.

The question is: how to wipe them out of the genealogy game and replace them with other more obscure matriarchs whose direct matrilineality died out? Who would be the choosen ones? What would be the influence and relevance of such replacements?

Feel free to discuss any other royal genealogy stuff here in this thread!
 
Well, off the top of my head, perhaps marry Louis XV to one of the other brides proposed for him? (Maria Barbara of Portugal, OTL Queen of Spain; Empress Elizabeth of Russia; a princess of Lorraine; Anne of Hanover etc.) Or replace Marie-Thérèse de France, Madame Royal's miscarriages/phantom pregnancies with children.

Or do I have the wrong idea of how this works?:confused:
 
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