Prince Phillip of Spain married bloody Mary I in 1554. These were reigning monarchs after Phillip II’s acsension in 1556. There were huge constitutional issues about him being legally king of England, the Kingdom being his property as Mary’s husband under the English common law doctrine of [*jure uxoris*](https://en.wikipedia.org/wiki/Jure_uxoris)*.* If there had been more than a false pregnancy possibly due to dropsy their issue would have been heirs to England, and Spain too if the presumptive heir Don Carlos had died without issue as he did historically, though it is very unlikely that England would have accepted this. As Liz 2 and Juan Carlos are constitutional monarchs it’s likely a solution would have been found such as 1 first child gets Spain 2nd England etc.
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