WI Isabella of Aragon, Queen of Portugal lives?

What if Isabella of Aragon, Queen of Portugal survives the birth her son Miguel da Paz, but was rendered infertile. Miguel still dies in the summer of 1500. (He was born sickly) Lets say Isabella lives to 1533. What happens to the Portuguese succession after Manuel I of Portugal's death? Who does Maria of Aragon marry? There was talk of her marrying James IV of Scotland. What happens to the Holy Roman Empire with a surviving Philip the Handsome? What would the ramifications be with this POD for Europe and the World? Please discuss!:)
 
What if Isabella of Aragon, Queen of Portugal survives the birth her son Miguel da Paz, but was rendered infertile. Miguel still dies in the summer of 1500. (He was born sickly) Lets say Isabella lives to 1533. What happens to the Portuguese succession after Manuel I of Portugal's death? Who does Maria of Aragon marry? There was talk of her marrying James IV of Scotland. What happens to the Holy Roman Empire with a surviving Philip the Handsome? What would the ramifications be with this POD for Europe and the World? Please discuss!:)

Well if Isabella is barren, won't that just put off the Habsburg's inheriting Spain and its empire? Also, if she stays barren and theirs no possible heir (I admit I don't know much about Portugal so not really sure who's next in line) Manuel could try to get an annulment. It probably wouldn't work, but it is possible. Hell a portuguese Infanta married into the Valois-Burgundy so the Habsburgs might end up being the heirs to both Spain and Portugal.

As for Philip, well there's no telling what effect that could have but I'll take a guess. With the Emperor still residing in Austria/the HRE it could be possible to for Philip I to restore some of the Empire's central authority. That's probably unlikely but its still a possibility. The interesting part will be his responce to the Protestant Reformation. Most TLs I've red that has a surviving Philip the Handsome has the HRE braking away from Rome. I don't know how likely it is but that's what I've red.
 
Even if she lives and is rendered barren, she'd still remain the heiress of Spain over Joanna. The King of Portugal might seek an annulment, but it's still a chance for him to rule Spain through his wife. He might be able to work something out such as gaining the crown matrimonial (if such a thing exists in Spain, not really sure). If he outlives his wife, he might be able to remarry and sire an heir to inherit Portugal, Castile, and Aragon.

It seems unlikely though. All this would do IMO is put off Joanna's inheritance of the two kingdoms. Philip lives longer though, so we might see what he can actually do as king, assuming Joanna goes mad as OTL. She was already showing signs before she went to Castile in 1505, anyways.
 
Manuel I of Portugal died in 1521 in OTL, so I believe that wouldn't change in this ATL and I said Isabella dies in 1533 in this timeline. He would not have a chance to remarry. I also found out who will succeed in Portugal after Manuel dies it would be the grandson of Eleanor of Portugal, Philip I, Holy Roman Emperor. Philip would probably appoint his son the future Charles I of Spain to be his regent in Portugal and later Castile and Aragon after the death of Isabella II & I of Castile and Aragon, because he would be busy ruling the Holy Roman Empire. Who would Charles marry? Would he marry Mary Tudor sister of Henry VIII?
 
Manuel I of Portugal died in 1521 in OTL, so I believe that wouldn't change in this ATL and I said Isabella dies in 1533 in this timeline. He would not have a chance to remarry. I also found out who will succeed in Portugal after Manuel dies it would be the grandson of Eleanor of Portugal, Philip I, Holy Roman Emperor. Philip would probably appoint his son the future Charles I of Spain to be his regent in Portugal and later Castile and Aragon after the death of Isabella II & I of Castile and Aragon, because he would be busy ruling the Holy Roman Empire. Who would Charles marry? Would he marry Mary Tudor sister of Henry VIII?

Actually Manuel I had two surviving older sisters:
  • Leonor (1458-1525), who was none other but the queen dowager of Portugal by virtue of her marriage with king João II. She had no surviving issue by then.
  • Isabel (1459-1521), who was the duchess of Braganza. So the Braganças would inherit the Portuguese crown sooner than OTL...
 
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Actually Manuel I had two surviving older sisters:
  • Leonor (1458-1525), who was none other but the queen dowager of Portugal by virtue of her marriage with king João II. Died childless.
  • Isabel (1459-1521), who's the duchess of Braganza. So the Braganças would inherit the Portuguese crown sooner than OTL...

With the portuguese succession being sort of murky, would the Habsburgs just enforce their claim militarily? I mean its possible, that is how Philip II got the Portuguese throne in the first place.
 
With the portuguese succession being sort of murky, would the Habsburgs just enforce their claim militarily? I mean its possible, that is how Philip II got the Portuguese throne in the first place.

I think they'd bide their time. After all, they weren't liked very much in Charles V's time in Spain, and with Philip I'm not sure it'll be different. Especially if he ends up Emperor, he's going to be busy with the Lowlands and Germany, which just adds Spain to the mix. They'll probably support whoever is able to take the throne, probably the Braganzas, and arrange a marriage. Charles V married a Portuguese princess IOTL anyways, and this is when Portugal is at her height of wealth and power. When Philip II claimed the crown, they were in decline.
 
With the portuguese succession being sort of murky, would the Habsburgs just enforce their claim militarily? I mean its possible, that is how Philip II got the Portuguese throne in the first place.

Not as murky as in 1580 when the claimants had to trace their line all the way back from King Manuel I (d. 1521). Since in this case the king has sisters and nephews it seems pretty straightforward...
 
I think they'd bide their time. After all, they weren't liked very much in Charles V's time in Spain, and with Philip I'm not sure it'll be different. Especially if he ends up Emperor, he's going to be busy with the Lowlands and Germany, which just adds Spain to the mix. They'll probably support whoever is able to take the throne, probably the Braganzas, and arrange a marriage. Charles V married a Portuguese princess IOTL anyways, and this is when Portugal is at her height of wealth and power. When Philip II claimed the crown, they were in decline.

Philip will be busy just like Charles was IOTL, however he's soon in a position, that he can place each son as a regent in the two main components of their dynastic power Charles in Castille-Aragon and Ferdinand in Austria-Burgundy. Besides Maximilian still lives a few years.
Regarding any potential division, I can see Philip letting his sons inherit, where they previously acted as regent.

Furthermore Charles V did marry a Portugues princess IOTL, but in part because there also weren't French or English princesses of the right age available at that time and he needed a heir.
 
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