Henry VIII and Castile

If Henry VIII had had sons by Queen Catherine who lived, would they be able to claim the thrones of Aragon or Castile? Ferninand and Isabella left no surviving sons..I'm not completely sure of the genealogy, but would'nt any sons of Henry and Catherine have a legal claim?
 
The main problem, as Dan alludes to, is that Catherine was the youngest of five children, and therefore was placed behind them and all of their heirs in the succession. Yes, the throne didn't go to a son, but since Catherine's sister Joanna (Joanna the Mad) was alive, she inherited first, and Joanna had numerous children. After Joanna is Marie, Queen of Portugal, and she had a few children too. Then comes Catherine. You'd have to eliminate all of them to let Catherine be the legitimate claimant. Also, the problem with Joanna is her mental instability led Ferdinand of Aragon, who survived his wife and still was ruling Castile (he died in 1516), to authorise himself to take control of Aragon as regent, and he would be hard to wrest control from. By most accounts he was a bit of a power-hungry figure. You'd have to neutralise him, too...
 
Catherine was the youngest daughter of Ferdinand and Isabella. The Spanish crowns didn't follow salic law, meaning women could inherit them. As Catherine was the youngest, she could only become Queen IF all her sisters and their children died. Extremely unlikely, but I suppose it's possible.
 
Actual inheiretance may be a bit to much, but Henry and Catherine's children will have a claim. Whether or not they pursue the claim for its own sake is questionable, but it does give them that diplomatic option. So even if they do not succeed (or touch off wars of succession), this still gives them the possibility of using those claims as political tools to various purposes.
 
Actual inheiretance may be a bit to much, but Henry and Catherine's children will have a claim. Whether or not they pursue the claim for its own sake is questionable, but it does give them that diplomatic option. So even if they do not succeed (or touch off wars of succession), this still gives them the possibility of using those claims as political tools to various purposes.

I'm not so sure. By this period, the age of electing the most suitable candidate from the closest heirs was gone. The inheritances of Henry VIII's children were an anomaly rather than a regular event. By this age, two children of the same parents were strictly defined as to where in the line of succession they fell. You couldn't just say "my mother X was your mother Y's younger sister, but I believe I have just as good a claim". In that circumstance Princess X had to respect Princess Y's superior claim. Full stop. The only way it could be "exploited in the future" is if all the closest claimants died before the incumbent, leaving only distant claimants left, and uncertainties on where they all lay. That, for instance, is the only way that Philip II took the throne of Portugal, and even then he had to bribe a candidate out of the way and then militarily defeat another.
 
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