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IOTL Habsburgs get Bohemian and Hungarian thrones after Louis II Jagiellon was killed at Mohacs, leaving no kids. And later they tried to get the rest of former Jagiellon realms after Polish-Lithuanian Jagiellon line died out too. What about reverse situation? Considering heavy Jagiellon-Habsburg intermarriage IOTL it seems possible. So we have less lucky Habsburgs (say Ferdinand died before Mohacs without kids, while Charles happened to be sterile). And more lucky Jagiellons (Louis II had a son with Mary of Austria, meanwhile in Poland Bona dies in childbirth, giving birth to Sophia, Sigismund the Old remarries to widowed Eleanor of Austria around 1524-she was proposed to him before she married Manuel, but Portuguese match was more important for Charles then, now, when Manuel is death, she is free to marry Polish king).
So after Mohacs Hungarian and Bohemian thrones are inherited by baby Louis III, supported by his uncle Charles and greatuncle Sigismund. Time passes. Charles V has no kids. His sister Catherine had few-all short living. Other sister Isabella had only daughters. So by the time of Charles' death his closest living male relatives are Jagiellon sons of Mary and Eleanor. Sons of Sigismund the Old and Eleanor of Austria had the best genealogical claim to Spanish throne and Burgundian inheritance. But mere genealogy is not guarantion of success. Would Jagiellons succeede in taking inheritance of Habsburg Dynasty once Charles dies? I think he could call his nephew by Eleanor to Spain, once it is clear, that he would not have kids on his own, to raise him as heir. Still, death of Charles would create crisis, succession would not be smooth, and Imperial throne is elective, so non-German is not likely to be elected. Spain seems to be easiest part if the heir is raised there, Austria is close to Jagiellon realms, but Wittelsbachs also are likely to try their chance there. France, with no doubts, would try to use chaos to grab parts of Burgundy. How would final outcome looks like? That is, without doubts, reciepe for biggest Jagiellon-wank imaginable.
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